Distributing System and Lamps (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ...from corroding the wire. This inner coating is then covered with a hard braid of cotton or hemp, woven on to the wire, or the wire is served with a' tape and insulating compound. Where the wire is to be continually moist, gutta percha is better than rubber, but it is more costly. In the more expensive grades of wire the coatings are greater than two in number, and they alternate, insulating compound and then braid or tape. In Figs. 201-203 are shown 20a ioee Patent"' "au, ator the manner of application of the insulation and the braid. Joints in Overhead Lines.--Whether an electrical conductor is bare or insulated it is necessary that any joint made in it shall be nearly equal in conductivity and in mechanical strength to the Fig. 201. Insulated Line Wire. rest of the conductor. The ordinary "lineman's splice" (Fig. 204) has been the standard practice for galvanized wire iron, in telegraph lines; but the use of copper wire, both hard and soft drawn, and the necessity for better connection with heavy currents, has resulted in the Fig. 202. standard conductor, inadoption of various special forms of sulated for 0ut'"" Workjoint. Of these the Mclntire joint illustrated in Fig. 205 is a prominent example. Fig. 203. Overhead Wire with Weatherproof Insulation. This joint is made by use of a "connector" which consists of two tubes drawn side by side out of one piece of copper. The internal diameter of each of these tubes corresponds to the ex Fig. 204. Lineman's Splice. ternal diameter of tne wire to be spliced. The two wires need not be of the same size. H?) Fig. 205. Mclntyre Wire Joint. The joint is made by slipping the wires inside the tubes, and then by means of special pliers, twisting the tubes one on the...