. Official proceedings . High Efficiency Train Dispatching Telephone Circuit. The circuit known as the Western Electric standard high ef-ficiency telephone train dispatching circuit was designed by theengineers of that company to meet the severe requirements en-countered. A switching device was provided in the circuit to beoperated when talking. In the normal position, with the receiver•removed from the hook, the receiving circuit connects merely by acondenser and a special receiver bridged directly across the impedance of this circuit is about 2400 ohms to talking cur-rent, practical
. Official proceedings . High Efficiency Train Dispatching Telephone Circuit. The circuit known as the Western Electric standard high ef-ficiency telephone train dispatching circuit was designed by theengineers of that company to meet the severe requirements en-countered. A switching device was provided in the circuit to beoperated when talking. In the normal position, with the receiver•removed from the hook, the receiving circuit connects merely by acondenser and a special receiver bridged directly across the impedance of this circuit is about 2400 ohms to talking cur-rent, practically all of which is in the receiver, which is woundto approximately 6to ohms. Normally, neither the primary nortlie secondary circuits are closed through the induction coil. The circuit was arranged in this manner so as to reduce thedrain on the batteries when receiving and to obviate the necessity-of receiving through the secondary winding of the induction coil, io6 Proceedings Railway Club of Pittsbiiri^h. as this wou
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