. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. ition of rest, its projecting arm tis in such a position that the arm D is drawn against it, by the tension of the adjustable spiralspring s, and is, therefore, in electrical contact; but when the armature of the transmitter isdepressed, the arm t is withdrawn, and the lever D falls back, by the tension of its spring s, againstthe projecting stop a^ of the relay armature A, The connections are arranged as follows ;—One poleof the main battery E is connected to the fulcrum a of the relay armature A, and the
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. ition of rest, its projecting arm tis in such a position that the arm D is drawn against it, by the tension of the adjustable spiralspring s, and is, therefore, in electrical contact; but when the armature of the transmitter isdepressed, the arm t is withdrawn, and the lever D falls back, by the tension of its spring s, againstthe projecting stop a^ of the relay armature A, The connections are arranged as follows ;—One poleof the main battery E is connected to the fulcrum a of the relay armature A, and the other pole ELECTEICAL ENGINEEEING. 527 to earth at G. The fulcrum of the transmitter T is also connected to earth, a spark coil r beinginserted, equal in resistance to the battery in the usual manner. The line L goes first to thehelices of the relay M, and thence to the fulcrum d of the contact lever D. The transmitter T maybe worked directly by hand in the same manner as an ordinary key, but it is preferable to arrangeit in the ordinary way with a local magnet m and key K. 1103 L. The diagram represents the normal position of the apparatus when not in use. The armatm-espring Sj is adjusted to correspond to the incoming currents. When the home station has its key Kopen, the relay and sounder respond to the writing of the distant operator. Tlie currents enteringat L pass through the relay M, and thence find their way to the earth by way of the contact leverD, transmitter T, and spark coil r. The upper spring s is so adjusted that when acting in conjunc-tion with the spring Sj their combined pull will hold the armature lever A in its back stop c, withsufficient force to withstand the attraction produced in the relay magnet M by the action of themain battery E, either at the home or the distant station alone, but the combined effect of the twobattel ies, when both of them are in circuit at the same time, will be sufficient to overcome the com-bined tension of the springs withou
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
