. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . , 9 tons; service, passenger. Wireless for Trains. The successful transmission of wire-less messages to a moving train on theLake Shore & Michigan Southern Rail-way, which was accomplished Feb. 27of this year, recalls a similarly success-ful experiment made on the GrandTrunk Railway on Oct. 13, 1902, a briefnotice of which appeared in andLocomotive Engineering on page 504,December, 1902. Before the close of the twentiethcentury wireless telegraph in someform may probably be adopted fo
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . , 9 tons; service, passenger. Wireless for Trains. The successful transmission of wire-less messages to a moving train on theLake Shore & Michigan Southern Rail-way, which was accomplished Feb. 27of this year, recalls a similarly success-ful experiment made on the GrandTrunk Railway on Oct. 13, 1902, a briefnotice of which appeared in andLocomotive Engineering on page 504,December, 1902. Before the close of the twentiethcentury wireless telegraph in someform may probably be adopted for trainservice, and fast trains of the futuremay have their regular equipment mak-ing possible the exchange of messageswhile the train is in motion. If this isever brought about it will greatly in-crease the safety of railroad travel be-cause of the possibility of recalling anincorrect train order after a train hasleft a station or of halting a train fol-lowing one that had stopped, thus pre-venting a serious accident. Wireless transmission depends for itsoperation upon the sending and receiv-. TR.\CK L.^YI^•G IN SOUTH AFRICA. ing of electro-magnetic waves throughthe atmosphere. Several wires knownas the antennae or aerial line are placedat a considerable height above theground and are connected to one sideof a spark gap. The other side of thespark gap is connected to a pipe or ironrod driven several feet into the ground,and known as a ground connection. The spark gap is simply the spaceleft between the ends of the wires. Theterminals are metallic balls placed afew inches apart. A series of sparksfrom an induction coil is made topass across the spark gap. The in-duction coil is supplied with electricityfrom a battery or dynamo. The pas-sage of these sparks across the gapset up currents in the aerial line thatsurge or vibrate back and forth a greatmany times a second. These oscilla-tory currents, as they are called, sendout electro-magnetic waves from theaerial line into the a
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