The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 336
gh the openings in thecurved support on the left. Hence the adjustment bythis means and that of the retractile spring and upperscrews can be adapted to any current which may besent over the line. THE ELECTRIC TELEGRAPH. 319 Cut-Out, Ground Switch, and Lightning Arrester.—Thesethree instruments, of… … Fig. 104. mounted on an insulating block, the central plate hav-ing a row of points on each side. This block is attachedto the wall in any convenient position, the end platesconnected with the terminals of the line, and the officeinstruments placed in circuit between them, and thecentral plate…
Electricity · Magnetism
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