A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 492
nute.A short test-tube may be employed to cut off cur-rents of air (see Fig. 204, ^ 186). The ends of the coil may be carried to binding-posts, / and g. Connections at / and g may also, bemade by simply twisting the wires together (^ 193,11). When an ordinary battery current is sent throughthe… … Fig. 230. of the number of vibrations which it produces in amagnetic needle. In accordance with this law, thedimensions of the instrument have been chosen sothat the square of the number of vibrations com-pleted in 1 minute may represent approximately thestrength of the current in thousandths of an…
Physics
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