. Notes on torpedoes, offensive and defensive. ndedand have proved perfectly effective. For a permanent joint we have the ordinary gutta-percha Permanent joiand India-rubber joints, which, under certain circumstances,would be very useful for submarine purposes. These aresomewhat troublesome to make, and would require a con- joints. in cables. 138 siderable time to render them sufficiently good for the pur-pose required. They must be made deliberately and are sim-ilar to those used for ordinary submarine-telegraph mode of making such insulated joints as recommended bythe India-rubber
. Notes on torpedoes, offensive and defensive. ndedand have proved perfectly effective. For a permanent joint we have the ordinary gutta-percha Permanent joiand India-rubber joints, which, under certain circumstances,would be very useful for submarine purposes. These aresomewhat troublesome to make, and would require a con- joints. in cables. 138 siderable time to render them sufficiently good for the pur-pose required. They must be made deliberately and are sim-ilar to those used for ordinary submarine-telegraph mode of making such insulated joints as recommended bythe India-rubber, Gutta-percha, and Telegraph-works Com-pany, Silvertown, North Woolwich, is as follows: For a gutta-permanent gut- percha cable remove about 1J inches of the insulation at theends. After warming gently it is easily pulled off with thefingers, (this is much safer than cutting ;) clean the two endswith emery-cloth, and file a J-inch scarf on them, (see Fig. 56.)The wires are then caught with the scarfs together in two ta-percha joint. Fig. small vises, fixed on a bench, one working on a slide, so thatthey can be set at any required distance apart, and soldering, clean the scarf off with a small file. Thenbind it round with four strands of fine copper wire, laid sideby side j loop one end on the left-hand vise, and wind fromleft to right, taking care that the wires are evenly laid onand do not ride over each other ; the length of the binding-should be about 1J inches; the ends of the binding wiresare now snapped off by a sharp tug with the pincers. Thisbinding is then soldered at the center and at the ends,leaving twro parts of the binding unsoldered, so that if thescarf be drawn asunder the four-strand wire shall still connectthe two ends and form a metallic circuit. The joint is then well washed to remove all acid from In scarfing a strand conductor, the two ends are first sol-dered, making them solid. If the diameter of the conductorexceed No.
Size: 2529px × 988px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1872
