| 摘要 |
<PICT:1061684/C6-C7/1> A tube of varying external shape is made by electrodepositing metal on a former consisting of a series of sections assembled together and of corresponding configuration to the tube, and removing the former by melting or dissolving it. The former to make a tube Fig. 1, is preferably made of slugs of aluminium wax, resin, or low melting metal e.g. cerro-metal of varying diameters in required size and form threaded on a wire. The assembled former is provided with frusto-conical members 11 where diameter of the former changes. The former when non-metallic is given a thin coating of metal by vacuum plating or spraying and is then plated with Ni, Fe, Co, or Cu to a thickness of up to .004". The former is then removed by melting or alkali when aluminium is used. The formed tube is used as the inner electrode of a fuel tank capacitor measuring device. |
