Figs. 962 and 963.—McIntire sleeve and sleeve joint. An approved method of making the joints of telephone lines is by the use of some form of sleeve, such as is shown in [fig. 962]. This consists of two copper tubes of the required length, and of sufficient inside diameter, to admit the ends of the wires to be joined, fitting tightly. The tubes are then gripped with a tool, shown in [fig. 964], and twisted around one another, so that the wires are securely joined and locked, as shown in [fig. 963].
Ques. How are the wires spliced?
Ans. There are several methods of splicing wires. Fig. 961 shows the American wire joint, and [fig. 963] the McIntire sleeve joint. In making a joint, the two ends are gripped by come alongs and drawn up to the proper tension with tackle as shown in [fig. 958]. The joint is then made as shown in the illustrations.
Transpositions.—In some classes of circuit, as for instance telephone lines, the current is often seriously affected by electrostatic induction from other lines, and also from power circuits, owing to the fact that the surfaces of the wires form, as it were, so many charging plates of an electrical condenser, with the intervening air as the insulating layer or dielectric.
Fig. 964.—McIntyre's twisting clamp for wires 00 to 16 B. & S. gauge.
