. The practical telephone handbook and guide to the telephonic exchange . sleeve, and then fitting over them a leadcap as shown at the top of Fig. 399. The wires and the openend of cap are bound round with ozokerite tape for betterprotection. As shown in the figure, the pothead is fixed atthe top of a distributing pole, which is the best position forterminating. A branch cable, with joint, is also shown con-nected to the pothead for distributing purposes. To ensure the penetration of the composition between thewires, use is made of air compressed to about 20 to 25 lbs. persquare inch, a specia
. The practical telephone handbook and guide to the telephonic exchange . sleeve, and then fitting over them a leadcap as shown at the top of Fig. 399. The wires and the openend of cap are bound round with ozokerite tape for betterprotection. As shown in the figure, the pothead is fixed atthe top of a distributing pole, which is the best position forterminating. A branch cable, with joint, is also shown con-nected to the pothead for distributing purposes. To ensure the penetration of the composition between thewires, use is made of air compressed to about 20 to 25 lbs. persquare inch, a special machine being employed for this purpose. Cable Heads.—Whilst the pothead joint is a very satisfactoryand economical method of terminating a dry-core cable wherethe wires do not need to be disturbed it is not a sufficiently2c 39& PRACTICAL TELEPHONE HANDBOOK flexible method of terminating where it is necessary at times toalter the connections of the wires as with covered wire distribut-ing, so that it is now usual to terminate cables for such a purpose 7 #^fl_n. Porcelain. Basefor Terminals FRONT ELEVATIONWITH LID REMOVED SECTIONALELEVATION Compound ^M/. Leads to Open Wires TRANSVERSE SECTION Figs. 396, 397, and 398. Terminal Box (Reproduced by permission of the Proprietors of Electrical Engineering) on a cable-head or terminal box of the form shown in , 397, and 398. It consists of a cast-iron box with cast-ironlid hinged at the top so that it can be lifted entirely out of theway. A thick porcelain block is screwed into a recess with apacking so as to form a closed chamber except for an openingat the bottom fitted with a brass nozzle through which thecable passes and is rendered airtight by a plumbers poieelain block is perforated for screw terminals at the UNDERGROUND WORK 397 front and soldering tabs at the back to which the paper-coveredcable wires are soldered before the block is screwed in this is done the chamber is tilled with a m
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
