Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 348
Fi^ 299.-Telegraph Sounder. pivoted at A A, carrying a platinum contact point, B, whichis brought into contact by depressing the knob against theaction of the spring, S. On depressing the lever by the knob,N, the two platinum points, B, P, connected to the line byposts C and D, are brought into… … 330 PRACTICAL ELECTRICITY. electromagnet, M, which is connected in circuit by tw«binding posts, P, P. A clicking sound is produced at eachu make of the circuit and a spring pulls the armature backon break of circuit. In long lines the current, due to thehigh resistance, may be so small as to render…
Electricity · Magnetism
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