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198 results about "Lead lines" patented technology

Early hydrographic surveys involved measuring depths using a hand-held lead line with positions determined by three-point sextant fixes to mapped reference points. Lead lines were ropes, or lines, with graduated depth-markings and a lead weight attached to the end.

Method and device for controlling thickness of steel wire hot-plating layer

The invention relates to a method and a device for controlling the thickness of a steel wire hot-plating layer. The control method comprises an inert gas swabbing process, a cooling process and a cutting-off process which are carried out in sequence and is characterized in that: the hot-plating steel wire after the inert gas swabbing process is vertically leaded out for continuously performing electromagnetic swabbing process and then performing cooling and cutting-off processes; the magnetic field acted in the electromagnetic swabbing process is a single-phase and alternative uniform magneticfield, wherein the acted magnetic field force ranges from 20A to 1000A. The control device comprises a gas swabbing device used in the inert gas swabbing process and is characterized by being suitable for the control method in the invention. The control device further comprises an electromagnetic swabbing device which is vertically mounted above the gas swabbing device and ensures that the leading line of the hot-plating steel wire from the electromagnetic swabbing device maintains vertical; the electromagnetic swabbing device comprises an electromagnetic swabbing device, a magnetic field generator and an automatic electric cabinet electrically connected with the electromagnetic swabbing device in sequence; the automatic electric cabinet comprises a magnetic field generator master controller and a gas swabbing automatic electric cabinet; and the electromagnetic swabbing device and the magnetic field generator are provided with a set of constant-temperature cooling systems.
Owner:TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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