Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 145
er one—orit may be a very fine wire coiled into a spiral, or a wire 134 PRACTICAL APPLIED ELECTRICITY 3 may dip into a cup of mercury. A DArsonval galvanometeris shown in Fig. 97. The deflections of the coil are measuredby means of a telescope and suitable scale, together witha small mirror mounted… … Fig. 97 An instrument of this kind can be constructed so that it isvery sensitive and will respond to extremely small currents.It is not subject to outside disturbances to any great extent,such as stray magnetic fields, changes in the strength of theearths magnetic field, etc. This instrument can…
Electrical engineering
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