Coin

Abstract

The invention relates to a coin which comprises an imprint of the nominal value in the respective currency unit and the area of validity and optionally additional imprints and which is characterized in that the coin has a circular shape; the coin has regularly spaced imprints of graduation lines on both sides, the graduation lines together forming a scale for measuring angles and pointing from the edge in the direction of the origin of the angle scale; at least some of the graduation lines extend over at least the majority of the distance between the edge and the origin of the angle scale; and a corresponding scale designation is imprinted at least next to some of the graduation lines, the unit corresponding to the respective scale optionally also being specified. The invention also relates to the use of said coin for measuring angles and optionally also section lengths.

Description

[0001] coin

[0002] The present invention relates to a novel coin and its use for measuring angles and, if necessary, also distances.

[0003] STATE OF THE ART

[0004] Currencies are means of exchange used to simplify the exchange of goods and services in the economy. They serve as units of account and stores of value and are usually issued and supported by a central authority, such as a government or a central bank. The use of currency enables the efficient and convenient exchange of goods and services and is an essential component of economic systems. On the other hand, measurements are indispensable for trade and commerce. They allow for the description, quantification, and comparison of goods in a standardized manner. Accurate measurements are necessary to ensure that a product meets the specifications required by the buyer and seller, such as having a specific length or weight.Measurements are also used to determine the value of goods, as prices are often based on the quantity or quality of the goods traded. Furthermore, measurements are used to establish standards to ensure that certain products are safe and suitable for their intended purpose.

[0005] For a long time, goods and services have been primarily paid for in cash, in the form of banknotes and coins. Despite the steady increase in cashless payments via credit or debit cards and internet transfers in recent years, these remain the main means of payment in private business transactions. Nevertheless, no banknotes or coins are currently known that are suitable for the precise measurement of physical quantities of objects, such as lengths, weights, or angles – regardless of whether these are properties of purchased goods or other items or objects encountered in everyday life.In the field of numismatics, several coins are known to feature scale markings, but these are all commemorative coins that are not actually used in commerce and consequently were not designed for practical measurements in everyday use. For example, the Austrian Mint issued a commemorative series of four 20-euro silver coins entitled "Towards the Sky" (2019: "The Dream of Flying," "The Era of Powered Flight"; 2020: "Journey Above the Clouds," "Faster Than the Sound"), each depicting sections of an angular scale or a compass rose. Only the fourth coin in this series, shown in Fig. 1A, will be discussed in detail here, as it is the only one to feature an angular scale marked in 10° increments, described as a "stylized section of a radar display."However, the depictions of the Concorde and the Eiffel Tower completely obscure a good part of the scale and its origin, making angle measurements practically impossible with these coins.

[0006] The coin "Terra 2023" from the Pressburg Mint (Bratislava), shown in Fig. 1B, features an uninterrupted and even numbered 360° angle scale as an artistic element. However, this coin is completely impractical as a measuring instrument because the numbers are illegibly small and the scale's divisions are extremely short, placing them far from both the edge and the coin's center. Even if an object smaller than the scale were placed on the coin, angles could not be read accurately. The same problem would arise if the coin were placed on a larger object to determine the angle: due to the distance between the scale and the edge, the very small size of the divisions, and the numbering, no values ​​could be read correctly.

[0007] And in Latvia, a 1-lats commemorative coin, shown in Fig. 1C, was issued in 2012 to mark the 150th anniversary of the Riga Technical University. It features a length and an angle scale, both of which are unnumbered, and whose markings, similar to those on the four Austrian commemorative coins, are positioned so far from the edge that no even approximately accurate measurements are possible – especially not of angles. Banknotes depicting measuring scales are completely unknown to the inventor.

[0008] Against this background, the aim of the invention was therefore to develop means of payment that are indeed suitable for measuring physical quantities of objects and with which simple and precise measurements are also possible.

[0009] REVELATION OF THE INVENTION

[0010] The present invention achieves this objective by providing a coin comprising an imprint of the nominal value in the respective currency unit and the area of ​​validity, as well as optionally further imprints in the form of characters, one or more graphics and / or security features, characterized by the fact that the coin has a circular shape; the coin comprises, on at least one of its two sides, regularly spaced imprints of graduations which together form a scale for measuring angles and point from the edge of the coin towards the origin of the angle scale, wherein at least some of the graduations extend over at least a large part of the distance between the edge and the origin of the angle scale; and at least next to some of the graduations, a corresponding scale number is imprinted, wherein optionally and preferably also the unit corresponding to the respective scale is indicated;as well as in a second aspect of the use of all embodiments of the coin according to the invention described below for measuring angles and, optionally, also distances, as will be explained in more detail below.

[0011] In contrast to the few prior art coins described in the introduction, on which such scales are imprinted as an indication of specific technical features or historical events, the coins according to the invention are indeed suitable for measuring angles, since the combination of features, even in the simplest embodiment described above, enables a very precise determination of angles between two existing lines (or even lines mentally generated by the user between two points that can lie either outside or inside the coin). A user who wishes to measure angles with such a coin simply needs to place the origin of the scale, which is marked by converging graduations, on the intersection of the lines and can then easily read the angle between them on the scale.

[0012] The first feature of the invention, that the coins according to the invention are all circular, seems obvious at first glance, but it is by no means self-evident, as demonstrated by the Latvian coin from Fig. 1 C mentioned in the introduction, but also by numerous other rectangular coins ("Klippen"), some of which are even in circulation as regular means of payment - which will of course be known to numismatists.

[0013] In combination with the features that all the graduations forming the angle scale point away from the edge towards the origin, several of which extend over at least a large part of the distance to the origin, and the scale is also numbered, the coins according to the invention are very well suited as a replacement for a commercially available protractor.

[0014] The angular measure used on the coins according to the invention is, in particular, the most widely used in everyday life, namely the degree measure with the unit degrees (°). Accordingly, the graduations are preferably depicted at regular intervals of 5°, 10°, 15°, and / or 20°, with the numbering preferably being stamped at intervals of 10°, 15°, 30°, and / or 45°. Alternatively—or additionally—the radian measure with the unit radians (rad) can also be used, preferably with integer quotients of 2TT, meaning, for example, integer multiples of TT / 4, and optionally also integer multiples of the radian, i.e., from 1 rad to 6 rad, being used for the numbering. The graduations are preferably provided at intervals of an integer fraction of the radian, for example, 1 / 10 rad, 1 / 5 rad, or 1 / 4 rad.Although the circular shape of the coins according to the invention would suggest otherwise, the origin of the angle scale does not necessarily have to be located at the center of the coin. In preferred embodiments, however, this is the case, and consequently at least some of the graduations extend over at least a large part of the length of the coin's radius towards the center, with at least some of the graduations preferably extending over the entire length of the coin's radius to the center, thus enabling more precise angle measurements.

[0015] However, in some preferred embodiments, coins according to the invention with the origin of the angle scale at the center may also have a central perforation or a central transparent area around the center of the coin, which facilitates the positioning of the coin for the purpose of angle measurement. The central perforation or the central transparent area is, in particular, also circular and has a radius whose length preferably does not exceed 30% or 25% of the coin's radius, in order not to unduly restrict the maximum lengths of the graduations from the edge of the coin to the edge of the perforation or the transparent area. In particularly preferred embodiments, at least some of the graduations of the scale actually extend over the entire length from the outer edge of the coin to the edge of the central perforation or the central transparent area.

[0016] In all embodiments with an origin of the angular scale located at the center of the circle, the coin edge (or at least the outer coin edge) has a reeding, wherein the reeds are provided at regular intervals corresponding to the smallest unit of the scale, e.g. 5 degrees (5°), such that at least some of the reeds on the coin edge represent extensions of all graduations of the scale beyond the edge of the coin.

[0017] The term "coin edge" (or "reeding") refers to the narrow side surface between the two edges on the circumference of the obverse and reverse of the coin. This edge can be smooth or, as described above, preferably a reeded edge according to the invention. If the spacing of these reeds corresponds to the smallest unit of the scale, all of its graduations appear to extend beyond the edge, as if bent vertically downwards if the coin is lying on a flat surface. This facilitates the positioning of the coin on, for example, printed lines and the reading of the angle between them during measurement.

[0018] In the case of a coin with a central circular perforation, the inner edge of the coin can also have a serration within the central perforation. In these cases, the serrations are preferably provided at regular intervals corresponding to multiples of the scale unit, e.g., 10°, 30°, or 45°. Given the preferred maximum perforation radius of no more than 30% of the coin radius, the serrations on the inner edge of the coin are preferably provided at relatively large intervals, e.g., 30°, 45°, or even 90°. In all cases, these serrations also represent extensions of at least some graduations of the scale beyond the inner edge, which is also advantageous for measurement.

[0019] In coins according to the invention with a central transparent area, this area, in preferred embodiments, consists of a transparent amorphous solid, i.e., a glass, for which, for example, inorganic silicate glasses or organic glasses made of transparent plastic are suitable. Particularly preferred are those glasses whose thermomechanical properties are adapted to the base material of the coins, the latter generally being a metal or a metal alloy, although the present invention is not limited to this. In particular, the thermal expansion of the base material and the material used for the transparent window should differ as little as possible in order to ensure dimensional stability and corresponding measurement accuracy over a wide temperature range.This is particularly desirable in designs where one or more markings simplifying measurements are depicted on the transparent area. These include, in addition to a central dot or crosshair at the origin of the angle scale, extensions of some graduations imprinted on the coin onto the window in the direction of the origin. All of these serve to enable more precise positioning of the scale's origin and more accurate reading of the measured angles. Specific examples of suitable materials for metal coins with a central transparent plastic window and their manufacture can be found, for instance, in RM Afonso et al., "A new type of bi-material coin", Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture 233(12): 2358-2367 (2019); DOI: 10.1177 / 0954405412470418.

[0020] In alternative embodiments, the origin of the angular scale is not located at the center of the circle, but at the edge of the coin according to the invention. In this case, all graduations again point from the edge of the coin towards the origin, with at least some of the graduations extending over the entire length from the edge of the coin to the origin located at the edge. In such cases, the graduations are preferably arranged symmetrically, starting from the edge position directly opposite the origin, at intervals of 5° or an integer multiple thereof.

[0021] In preferred embodiments of such coins according to the invention, at least the following graduations extend over the entire length from the edge of the coin to the origin: the graduation that forms a straight line from the edge position opposite the origin, passing through the center of the coin's circle to the origin, and two graduations at a specific angle to this, e.g., two at an angle of 15° or an integer multiple thereof. A particularly suitable angle is 45°, whereby the two graduations at the origin form a right angle at the edge of the coin.

[0022] Even in embodiments where the origin is at the edge of the coin, the coin's edge preferably has a reeded surface. Due to the aforementioned advantages, the reeds are again designed to represent extensions of all graduations of the scale beyond the edge of the coin. Regardless of the origin's location, in preferred embodiments, the coins according to the invention have no rim, either on the outer edge or, if a central perforation is provided, on the inner edge. A rim is understood to be a thickening at the edge of the coin. Should a rim be provided, it is preferably interrupted by the graduations pointing from the edge towards the origin, or even more preferably by all graduations, in order to simplify their extension in the form of reeding at the coin's edge and / or their conceptual extension in the plane beyond the edge of the coin.

[0023] Furthermore, for this reason, in preferred embodiments the edges of the coins are only slightly rounded, i.e. to the smallest possible extent necessary to avoid sharp edges.

[0024] In further preferred embodiments, the coins according to the invention additionally comprise regularly spaced markings of further graduations, which form at least one scale for measuring distances, wherein, optionally, at least next to some of these graduations, a corresponding scale number is marked and, optionally, the unit corresponding to the respective scale is also indicated. This at least one additional length scale, which may be marked on the same side as the angle scale or on the opposite side, enables – in addition to angle measurement – ​​the use of the coins according to the invention for measuring distances.

[0025] The graduations of the length scale are preferably stamped at regular intervals of 1 mm, 5 mm, and / or 1 cm if measurements are to be taken in meters. Alternatively, the intervals can, of course, also be integer fractions or multiples of 1 inch (1 in), which may be particularly desirable in the USA or the United Kingdom (and in some former colonies). In any case, preferably at least some of the graduations are numbered accordingly to simplify reading, and the corresponding unit of measurement is usually also indicated on the coin. In some preferred embodiments, both an angular scale and at least one length scale are depicted on the same side of the coin, and both the origin of the angular scale and the zero point of at least one length scale are located at the center of the coin's circle, which can facilitate positioning the origin for measurements.Alternatively or additionally, a coin according to the invention can comprise two embossed length scales on the same side, wherein the zero point of at least one length scale lies at the center of the circle of the coin, the graduations of which are depicted at regular intervals at right angles to a straight line passing through the center of the circle. Even more preferably, in such cases, either the zero points of both length scales lie at the center of the circle of the coin, and the graduations are depicted at regular intervals at right angles to a straight line passing through the center of the circle, which forms a right angle at the center; or the second length scale runs parallel to the one whose zero point lies at the center of the circle of the coin, so that the two scales allow length measurements in different units, wherein, for example, one length scale can display markings in meters, e.g.one every 5 mm and / or 1 cm, and the other in inches, i.e., integer fractions and / or multiples of 1 in.

[0026] In all these cases, where the zero point of at least one length scale lies at the center of the coin's circle, the coin's diameter is preferably an integer multiple of 5 mm or 1 cm or of 1 in, e.g., 2.5 cm or 4 cm or 1 in or 2 in. This offers the advantage that lengths greater than the coin's diameter can be determined simply by placing two or more coins according to the invention side by side.

[0027] Alternatively or additionally, in some preferred embodiments, a coin according to the invention may, in addition to at least one angular scale and optionally in addition to at least one continuous length scale, comprise a length scale formed by concentric circles around the center of the coin at regular radial intervals, wherein the distances to the center of the circles are preferably numbered, and wherein, even more preferably, at least one straight line passing through the center of the circle is embossed on the coin, optionally depicting two straight lines passing through the center of the circles that form a right angle at their midpoint. In this way, using a coin according to the invention, the lengths of objects shorter than the coin's diameter can be measured, for example, by placing such an object, particularly a circular object, on the coin.

[0028] Furthermore, the respective measurement deviation (measurement inaccuracy, measurement uncertainty) of the scales can be indicated on coins according to the invention, which may be, for example, 1% of the respective unit of measurement or numbering, such as ± 0.1° for numbering at intervals of 10° or 0.1 mm in the case of intervals of 1 cm.

[0029] BRIEF DESCRIPTION OF THE FIGURES

[0030] The present invention is described in more detail below with reference to preferred embodiments, which are not to be understood as limiting, and with reference to the accompanying figures, which illustrate the following:

[0031] Fig. 1 shows illustrations of the special coins mentioned in the introduction, which include imprints of scales;

[0032] Figures 2, 3, 4, 7, 12 and 14 are exemplary schematic representations of coins according to the invention with imprints or illustrations of angle scales and optionally also length scales; and Figures 5, 6, 8, 9, 11, 13 and 15 are photographs of simple first precursors or prototypes of coins according to the invention.

[0033] EXAMPLES

[0034] As mentioned at the outset, the three coins shown in Fig. 1 each bear markings of at least one angle scale or one angle and one length scale; however, these all serve merely as decoration or as references to certain technical features and / or historical events. Due to the scales not extending to the edge and the complete absence or virtually illegible smallness of the markings, all coins with scale markings known from the prior art are completely unsuitable for actual measurements of angles or lengths.

[0035] In contrast, a coin according to the invention can be used as a protractor even in its simplest embodiment because a) it has a circular shape, b) all the markings embossed on it point from the edge of the coin towards the origin of the angle scale, c) at least some of them extend over at least a large part of the distance between the edge and the origin, and d) at least some of them are numbered accordingly.

[0036] A simple embodiment of a coin according to the invention, with the origin of the angle scale located at the center of the circle, is shown in Fig. 2. More than half of the graduations of the degree scale, provided at 5° intervals, extend continuously from the outer edge of the coin to the origin, thus facilitating the reading of an angle to be measured. The markings are indicated at 45° intervals, and the (assumed) measurement deviation of ± 1° is also noted. The nominal value, the currency unit, and other markings would be located on the reverse side of this coin and also of most of the other embodiments of the coin according to the invention shown in the figures.

[0037] Fig. 3 is a schematic top view of a preferred variant of the embodiment from Fig. 2, which additionally features a circular central perforation L around its origin. In this case, the extended graduations of the degree scale extend continuously from the outer edge of the coin to the edge of the perforation L, which considerably simplifies the positioning of the coin for angle measurement, especially for measuring the angle between two points outside the coin. Apart from the perforation L, the two coin designs are identical.

[0038] Figure 4 shows a schematic isometric view of this preferred embodiment, from which it can be seen that the coin further features reeding on both the outer and inner edges. The reeds R on the outer edge are extensions of all graduations beyond the edge, i.e., also at 5° intervals, while the reeds R on the inner edge are at 45° intervals, which facilitates the reading of angles. Figure 5 is a photograph of a first prototype of such a coin according to the invention, which was cut from a stainless steel plate and provided with the corresponding markings by laser engraving. Figure 6 is a photograph of a similar prototype, which, however, is intended to have a circular transparent window T instead of the perforation L. This is only indicated in the present case by the underside of the coin from Figure 6.5. A transparent plastic film was affixed, onto which a central crosshair was drawn with a pen to mark the origin of the angle scale. For mass production of such coins according to the invention with a transparent window T, the entire transparent central area, i.e., with the same thickness as the metallic remainder, is generally made of a glass, such as a silicate glass or an organic glass made of plastic, as mentioned above, for example, a plastic disclosed in Afonso et al. (so), and is provided with a suitable, long-lasting inscription.

[0039] Fig. 7 is a schematic representation of a relatively simple embodiment of the coin according to the invention, in which the origin of the angle scale is not located at the center of the circle, but at an edge of the coin. For clarity, the graduations are also shown extended beyond the circumference of the coin, so that those located near the origin can also be identified. The graduations are omitted between 75° and 285°, as they would be barely visible anyway, especially in the case of coins that have been in circulation for a considerable time. The graduation that runs from the edge opposite the origin along a straight line passing through the center of the circle to the origin is shown (almost, i.e., with the exception of the numbering) over its entire length, as are the two graduations running at an angle of 45° to it, which thus form a right angle at the origin.In this way, the location of the origin is clearly identifiable, and the reading of measured angles is facilitated. Of course, in practice, additional graduations can also be extended towards the origin, for example, those at 10°, 30°, 330°, and 350°, to further simplify reading. Figures 8 and 9 are photographs of a precursor and a first prototype, respectively, of such an embodiment of the coin according to the invention. Figure 8 shows a precursor made of cardboard, while Figure 9 shows a prototype. In this case, the latter was die-cut from a brass plate, and the graduations and the markings were engraved by hand by the inventor. To improve the visibility of the graduations in the photograph, they are also shown extended beyond the circumference of the coin, by correspondingly scoring the wooden plate on which the coin rests.

[0040] Figures 10 to 12 show further embodiments of the coin according to the invention, although only length scales are shown in each case. The angle scale would be stamped on the reverse of the coin in all these embodiments.

[0041] Fig. 10 is a schematic representation of a coin with a length scale formed by concentric circles around the coin's center at regular radial intervals of 2.5 mm, with numbered radii ranging from 2.5 mm to 10 mm. Fig. 11 is a photograph of a prototype of the embodiment shown in Fig. 10, again made of cardboard, illustrating the prototype with a rhinestone gemstone placed in its center, evidently with a diameter of exactly 5 mm.

[0042] The embodiment shown in Fig. 12 additionally includes two straight lines passing through the center of the circle, forming a right angle at their midpoint, and whose graduations, perpendicular to the lines, are shown at intervals of 1 mm. Such embodiments simplify, for example, measurements of the length and diameter of circular or other objects placed on a coin according to the invention. Fig. 13 is a photograph of a prototype of a coin similar to that shown in Fig. 12, which, however, additionally features an angle scale on the same side of the coin. This prototype was also stamped from a brass plate, which was provided with the corresponding markings by means of laser engraving.The graduations of the angle scale are again provided at intervals of 5°, however, in this embodiment all graduations run continuously from the edge of the coin to the origin in the center of the circle - which is not preferable according to the invention, since the origin in the center is hardly recognizable anymore.

[0043] Finally, Figures 14 and 15 each show an embodiment with two parallel length scales, which means that the angle scale in these embodiments would be stamped on the reverse of the coin. In the schematic representation of Figure 14, one of the two scales runs through the center of the coin's circle and is marked "1 / 2 inch" there. The zero point of this inch scale is thus located at the edge of the coin, and the graduations are marked at intervals of 1 / 16 inch, with their lengths increasing from 1 / 16 inch to 1 / 4 inch, 1 / 8 inch, and finally to 1 / 2 inch. The diameter of the coin in this embodiment is therefore exactly 1 inch. The parallel scale, on the other hand, is marked in meters, with the zero point located at the center of the coin's circle and marked "0 cm". The graduations extend in both directions from this point at intervals of 1 mm, with those at 5 mm and 1 cm being shown longer and the latter also numbered. Fig.Figure 15 is a photograph of a first prototype of a similar embodiment, which was cut from a stainless steel plate and provided with corresponding markings by laser engraving. However, in this case, neither of the two length scales passes through the center of the coin's circle; instead, the scales are positioned so that a circular measurement is obtained between their two ends, in this case, for example, a length of 2 cm or 1 in. For comparison, a clove is shown in the photograph, the dimensions of which can be easily measured using such a coin according to the invention.

[0044] In summary, it can be stated that the present invention enables, for the first time, measurements of angles and, if necessary, also distances using a coin, which can be easily carried out by any owner of such a coin without having to have a protractor, a ruler or the like at hand.

Claims

PATENT CLAIMS 1. A coin comprising an imprint of the nominal value in the respective currency unit and the area of ​​validity, as well as optionally further imprints in the form of characters, one or more graphics and / or security features, characterized in that the coin has a circular shape; the coin comprises, on at least one of its two sides, regularly spaced imprints of graduations which together form a scale for measuring angles and point from the edge of the coin towards the origin of the angle scale, wherein at least some of the graduations extend over at least a large part of the distance between the edge and the origin of the angle scale; and at least next to some of the graduations a corresponding scale number is imprinted, wherein optionally the unit corresponding to the respective scale is also indicated.

2. Coin according to claim 1, characterized in that the origin of the angular scale is located at the center of the circle of the coin and at least some of the graduations extend over at least a large part of the length of the coin radius towards the center, wherein optionally at least some of the graduations extend over the entire length of the coin radius to the center.

3. Coin according to claim 2, characterized in that it comprises a central perforation (L) or a central transparent area (T) around the center of the circle of the coin, wherein the central perforation (L) or the central transparent area (T) is optionally circular and has a radius whose length is not more than 30% or not more than 25% of the coin radius.

4. Coin according to claim 3, characterized in that at least some of the graduations of the scale extend over the entire length from the outer edge of the coin to the edge of the central perforation (L) or the central transparent area (T).

5. Coin according to one of claims 2 to 4, characterized in that the outer edge of the coin has a reeding, wherein the reeds (R) are provided at regular intervals corresponding to the smallest unit of the scale, e.g. 5 degrees (5°), such that at least some of the reeds (R) on the edge of the coin represent extensions of all divisions of the scale beyond the edge of the coin.

6. Coin according to one of claims 3 to 5, characterized in that it comprises a circular central hole (L) and the inner edge of the coin has a ridge in the central hole (L), wherein the ridges (R) are provided at regular intervals corresponding to a multiple of the unit of the scale, e.g. 30 degrees (30°), such that at least some of the ridges (R) on the inner edge of the coin represent extensions of at least some graduations of the scale beyond the inner edge.

7. Coin according to one of claims 3 to 5, characterized in that it comprises a central transparent area (T) consisting of a transparent amorphous solid, i.e. a glass, wherein optionally one or more markings are depicted on the transparent area (T).

8. Coin according to claim 1, characterized in that the origin of the angle scale is located at the edge of the coin and at least some of the graduations extend over the entire length from the edge of the coin to the origin, wherein optionally at least the following graduations extend over the entire length from the edge of the coin to the origin: that graduation which forms a straight line from the edge position opposite the origin through the center of the circle of the coin to the origin, and each pair of graduations which run at a certain angle to it, e.g. those which run at an angle of 45 degrees (45°) to it and thus form a right angle at the origin.

9. Coin according to claim 8, characterized in that the coin edge has a reeding, wherein the reeds (R) are provided such that they represent extensions of all graduations of the scale beyond the edge of the coin.

10. Coin according to one of the preceding claims, characterized in that it has no rim on either the outer or inner edge if a central hole (L) is provided.

11. Coin according to one of the preceding claims, characterized in that it additionally comprises regularly spaced imprints of further graduations, which form at least one scale for measuring distances, wherein, if necessary, at least next to some of these graduations, a corresponding scale number is imprinted and, if necessary, the unit corresponding to the respective scale is also indicated.

12. Coin according to claim 1 1 , characterized in that on the same side of the coin both an angle scale and at least one length scale are depicted and both the origin of the angle scale and the zero point of at least one length scale are located in the center of the circle of the coin.

13. Coin according to claim 11 or 12, characterized in that it comprises two imprinted length scales on the same side, wherein the zero point of at least one length scale lies at the center of the circle of the coin, the graduations of which are depicted at regular intervals at right angles to a straight line passing through the center of the circle, wherein optionally the zero points of both length scales lie at the center of the circle and the graduations are depicted at regular intervals at right angles to a straight line passing through the center of the circle, which form a right angle at the midpoint, or The second length scale runs parallel to the one whose zero point lies at the center of the coin, and the two scales allow length measurements in different units.

14. Coin according to one of claims 11 to 13, characterized in that, in addition to at least one angular scale and optionally in addition to at least one continuous length scale, it comprises a length scale formed by concentric circles around the center of the coin at regular radial intervals, the distances to the center of the circle optionally being numbered, and optionally at least one straight line passing through the center of the circle being depicted on the coin, and optionally two straight lines passing through the center of the circle being depicted which form a right angle at their midpoint.

15. Use of a coin according to any one of claims 1 to 14 for measuring Angles and, if applicable, also distances.

Images