The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 340
Eig. 315.—Barnsbury (London) Apparatus-Room by the running coils, the latter being four in number situatedon vertical and horizontal diameters. Fig. 314 gives a view of the various parts of the motor takento pieces. These figures are taken from Mr Perrin-Maycocks THE POWER PLANT 3 Electric Lighting… … Fig. 316.—Ringing Dynamotor, etc. (Barnsbury), London Figs 315 and 316 show two 12-H.P. Heyland motors, con-nected to generators, as fitted in the power-room of the Barnsbury exchange. Ringing Plant.—In addition to the apparatus already 312 PRACTICAL TELEPHONE HANDBOOK described, separate…
Telephone
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