. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. in the artificial line at each station,must be so adjusted as to make its resistance exactly equal to that of the line A B, added to thatof one wire of the relay at the distant station. If the key at station A is depressed, the current fromthe main battery L B will divide at the point 3, one portion going by way of 4 and 6 to the line,passing through one coil of the relay, thence from the line through one coil of the relay at the ELECTEICAL ENGINEERING. 525 distant station B, Ly way VI. and IV. thence by I
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. in the artificial line at each station,must be so adjusted as to make its resistance exactly equal to that of the line A B, added to thatof one wire of the relay at the distant station. If the key at station A is depressed, the current fromthe main battery L B will divide at the point 3, one portion going by way of 4 and 6 to the line,passing through one coil of the relay, thence from the line through one coil of the relay at the ELECTEICAL ENGINEERING. 525 distant station B, Ly way VI. and IV. thence by III. and II. to the key lever at b, back contactc and wire XI., to the earth, the other portion going from 3, in an opposite direction, throughtlie home relay by way of 7, 8, rheostat W, and wires 9, 10 to the earth. These two branches ofthe current will be equal to each other, and will produce no effect upon the relay at A for thatreason. The relay at B, on the other hand, will be affected by the current coming from A, andwill respond to the movement of the key at the latter If now the key at B be also depressed, one half of the battery current tends to go to the line,but as it meets the current from A of opposing polarity, the current in the main line is neutralizedor becomes nil. The current in the artificial line at each station being no longer opposed by theline current, will operate the respective relays, and the signals given will correspond to the lengthof time the key is depressed at the opposite station. Thus each station receives its signal throughthe action of the distant battery only. A third position occurs when one of the sending keys, for instance, at B, is in the act ofchanging from the rear contact c to its front contact a, in which case the current from A isinterrupted at 6, and is, therefore, forced to pass through the second coil of the relay, but this timein the same direction, and thence through the rheostat W to the earth. The current arriving a
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
