. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. istance s acting as a shunt on the receiving instrument, much nearer to the battery end of theshunt than the line end. A suitable proportion between the resistance s and the instrument coils is4 or 5 to 1. The point where the key is connected may, if required, be made adjustable by meansof a sliding contact. Both the above arrangements can be applied to intermediate instruments verysimply, by making the point where the key is connected nearer to the middle of the instrument coilin the first arrangement, an
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. istance s acting as a shunt on the receiving instrument, much nearer to the battery end of theshunt than the line end. A suitable proportion between the resistance s and the instrument coils is4 or 5 to 1. The point where the key is connected may, if required, be made adjustable by meansof a sliding contact. Both the above arrangements can be applied to intermediate instruments verysimply, by making the point where the key is connected nearer to the middle of the instrument coilin the first arrangement, and of the shunt in the second method. The intermediate stations canthen communicate with each other, or the terminal stations, in duplex, and without batteries. The effect of the static induction of the line in the opposed battery system is as follows;—When both keys are in their normal position, the potential of the whole line is raised or lowered bythe opposing batteries above or below that of the earth, and the line will in consequence hold a 628 ELECTKICAL ENGINEERING. h -^ T rl. :^b charge which will depend for its quantity upon the inductive capacity of the line. When either ofthe keys is depressed, the potential of the circuit at that point will be the same as that of the earth,and half the cliarge of the line will flow out through the line coil of the instrument. In the secondof the two sjstems, Fig. 1105, the effect of the charge and discharge will be lessened by partbeing carried off by the shunt. At each depression of the key, a strong instantaneous current isflowing in one direction through the line coils of the instrument, and when the key is raised thereis another instantaneous current flowing in the opposite direction through the whole coil. Theeifects of the discharge, when not compensated, are, on the whole, iif^4. much less marked in this than ^ c B in tlie open circuit method of effectingthe compensation for the in-ductive discharge is by wind
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
