Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 152
rom A, diagonally, across the parallelogramto its opposite angle, the height of which is the tangentof the angle of deflection. By inspection of the diagram it is seen that the lawholds good in the subdivisions of the force A B, as at.5 .25 and .125, a truth admitted by all experimenters,as to the… … FIG. 62. 138 APPENDIX AND NOTES. The special feature which distinguishes this galvan-ometer from an ordinary one, is the extreme lightnessof the magnet or needle, and the delicacy with whichit is suspended in a horizontal position. Instead of anindex needle, to render the motions of the magnet…
Telegraph
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