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| "THE PHANTOPHONE"
Phantophone for Single-line Working and Grouping.Polished teak case, fitted with :-1 P.B. Standard Solid Back Transmitter, T 3470. 1 Adjustable Transmitter Arm, T 2947. 2 Double Pole Bell Receivers, T 2062. 2 Receiver Cords, T 1090. 1 Condenser, 0.5 mf., T 1674. 1 Condenser, 0.1 mf., T 1673. 1 Condenser, 0.05 mf., T 1672. 1 Induction Coil, 160 + 0.37 ohms, T 1276. 1 Induction Coil, 60 + 60 ohms, T 1277. 1 Switch Hook, T 1708. 1 Extra Receiver Hook, T 1718. 1 Buzzer, T 3744. 1 Ringing Key, T 3358. 1 Lightning Arrester, T 927. 1 Loud Speaking Receiver, T 2086. The front and desk are hinged and fixed by means of a screw.Exposed metal parts oxidized copper finish.. Length, 21ins. Width, 9ins. Depth, 10ins. Weight, 16lbs.This is a form of telephone for use on existing telegraph and block signalling circuits .During the past few years we have directed our attention to the problem of designing apparatus which will permit of the application of telephones to existing telegraph and block signalling circuits of relatively short length, such as are usually met with on railway lines.The result of our experiments is the " Phantophone," an instrument which is made in two distinct patterns, to suit the two sets of conditions generally met with, viz:-(a) The connection of a telephone circuit to a single-line telegraph or block signalling circuit. (Phantophone List No. T 714A.)(b) The connection of an earthed telegraph circuit to a metallic loop telephone circuit. (Phantophone List No. T 720A.)Taken from the ATM catalogue Telegraph Apparatus and Accessories No. 59 (Jan 1921) |
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Last revised: October 13, 2025FM2 |
ATM TELEPHONE
T.714A
For
simultaneous telephony on telegraph and block signalling circuits.