The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 583
ed rods 554 PRACTICAL TELEPHONE HANDBOOK lifting the wire on to branches of trees, etc., for insulation.(This applies only to temporary lines.) Earth connection hasto be made to complete the circuit, and this is done by drivinga metal rod into damp ground, or into living trees, so thatthe sap will… … Fig. 501.—Ericssons Portable Military Telephone Set is peculiarly liable. For signalling a buzzer is preferred toa magneto-generator and bell, as although it makes sufficientnoise to be heard by the attendant, the sound does not carryfar enough to be heard by the enemy in its neighbourhood.Fig. 501…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
