The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 152
and being placed in a derived circuit betweenthe points whose difference of potential is to be meas- ELE C TRIG ME A S UREMENT. 135 ured, while the ammeter has low resistance and is placeddirectly in the main circuit at any point where currentstrength is to be measured. It will be noticed that an… … Fig. 53. shoe magnet, the poles of which project into the narrowspace in front and are attached to two soft iron pole-pieces, as shown in Fig. 54. These inclose a circularspace, within which is mounted a soft-iron armaturecore, maintained in a fixed central position by attach-ment to a brass yoke…
Electricity · Magnetism
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