. The practical telephone handbook and guide to the telephonic exchange . of the telephone in thewar with Russia, and a great deal of their astonishing know-ledge of the movements of the Russians has been due to theirclever use of the instrument. The telephone has, in fact, be-come an indispensable adjunct to military warfare on a largescale. The line wires for use in connecting are usually thin barecopper ones carried on a reel which can be carried on horse-back or bicycle, and paid out on to the ground as they movealong, another man following, and by means of hooked rods 554 PRACTICAL TELEPH
. The practical telephone handbook and guide to the telephonic exchange . of the telephone in thewar with Russia, and a great deal of their astonishing know-ledge of the movements of the Russians has been due to theirclever use of the instrument. The telephone has, in fact, be-come an indispensable adjunct to military warfare on a largescale. The line wires for use in connecting are usually thin barecopper ones carried on a reel which can be carried on horse-back or bicycle, and paid out on to the ground as they movealong, another man following, and by means of hooked 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 make the connection. The telephone apparatus to be used naturally requires to besimple, light, waterproof, and of substantial construction, sothat it may withstand the weather and accidents to which it. 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 501 shows a very light and compact military set made byMessrs Ericsson, which was used by our army in South Africawith very satisfactory results. It weighs but 38 lbs., and isfurnished with a telescopic hand-micro and waterproof 4-wayconnecting cord. Fig. 502 gives the connections of theinstrument, and it will be seen that a double-spring push or MISCELLANEOUS APPLICATIONS 555 key is fitted, which when pressed connects the buzzerthrough the primary winding of an induction coil and abattery of two cells, and also connects the secondary windingdirectly to line, cutting out the receiver. This makes a veryeffective call, whi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
