Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 184
Fig. 90, and along this line let any numberof equal divisions be set off, beginning at O. Fromthese points draw back to the centre. The circle ^willthus be divided into a number of pieces, of which thosenear O are nearly equal, but which get smaller andsmaller away from O. These unequal pieces… … Fig. 90. into tangent-lines with accuracy than to divide it intoequal degrees ; hence this graduation, though convenient,is not used where great accuracy is needed. 200. Absolute Measure of Current by Tangent Gal*vanometer.—The strength of a current may be determined in absolute units by the aid of…
Electricity · Magnetism
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