Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 152
se. 9 APPENDIX A.—Clarks Double-shunt Galvanometer* is a very excel-lent form of the differential instrument. That is, it is woundwith two wires designed to carry currents in opposite direc-tions about the needle. One of these circuits extends from Ato B, (Fig. 60) the other from C to D. These… … divides itself into two equal portions; one flowing from B to Clarks Elementary Treatise,/. 47 132 MANUAL OF TELEGRAPHY. A and tending to deflect the needle to the right and the otherfrom C to D, deflecting it to the leit; but since the quantitiesand forces are precisely equal the needle remains at…
Telegraph
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