. American telephone practice . ^6]. WIRE CHIEFS EQUIPMENT. 637 Although the Wheatstone bridge method is not in accordancewith what is now considered the most advanced practice for wirechiefs use, it will be described briefly, as it is in use in a large num-ber of exchanges. In the right-hand portion of Fig. 466 is shown a testing trunkleading from the main distributing frame to the wire chiefs the left-hand portion is shown the circuit of a subscribers lineleading from the subscribers station to the switch-board apparatusat the central office through the arrester clips at the main boa
. American telephone practice . ^6]. WIRE CHIEFS EQUIPMENT. 637 Although the Wheatstone bridge method is not in accordancewith what is now considered the most advanced practice for wirechiefs use, it will be described briefly, as it is in use in a large num-ber of exchanges. In the right-hand portion of Fig. 466 is shown a testing trunkleading from the main distributing frame to the wire chiefs the left-hand portion is shown the circuit of a subscribers lineleading from the subscribers station to the switch-board apparatusat the central office through the arrester clips at the main board,the heat coils having been removed. The removal of the heat coils and insertion of the test plug dividesthe line at the distributing frame into two portions, one extendingout from the arrester to the sub-station and the other extending infrom the arrester to the switch-board apparatus. The two portionsso divided may be called the outside and the inside lines re-spectively. The four limbs (two each) of the two divisions of theline
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