. American telephone practice . FIG. PARTY LINE PARTY LINE SYSTEMS. 437 scriber on the party line; thus, on a four-party line four jacks wouldbe used for each line, instead of one, as in the original Hibbard sys-tem. The arrangement of the subscribers apparatus with respect to theline is the same in all respects as in the system just described, andthe operation of calling central is obvious from the diagram. In connection with the line conductors, a and a are four spring-. FIG. MODIFICATION OF HIBBARD SYSTEM. jacks, i, 2, 3 and 4. Each of these has a short
. American telephone practice . FIG. PARTY LINE PARTY LINE SYSTEMS. 437 scriber on the party line; thus, on a four-party line four jacks wouldbe used for each line, instead of one, as in the original Hibbard sys-tem. The arrangement of the subscribers apparatus with respect to theline is the same in all respects as in the system just described, andthe operation of calling central is obvious from the diagram. In connection with the line conductors, a and a are four spring-. FIG. MODIFICATION OF HIBBARD SYSTEM. jacks, i, 2, 3 and 4. Each of these has a short line spring, ft, along spring, n, and a tubular thimble, n2. The connection of thesesprings and thimbles to the conductors of the line is different in thecase of each jack as examination will readily show. The switch-board is provided with the usual plugs and cord cir-cuit, which includes a ringing key. This key, in addition to theusual pair of switch springs and their normal and alternate contact 438 AMERICAN TELEPHONE PRACTICE. anvils, has a spring, p, which is adapted to register with an anvil, />,when the key is operated. The arrangements of the jacks with respect to the line wires aresuch that the mere insertion of the calling plug in any jack willestablish the proper relations between the generator and the line,to operate the bell at the corresponding station upon the depressionof the key. Thus, suppose the operator wishes to call station i. Sheinserts the plug in jack, i, of th
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