St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 55
specialmeasurements, or by comparison with some standard in-strument, so that when the deflecftion is a certain numberof degrees, the current passing through it is known tobe of a certain strength. Fig. 67 shows an astatic galvanometer. Fig. 68 showsa tangent galvanometer, in which the strength of… … APPARATUS FOR ELECTRICAI, MEASUREMENTS. 53
Electricity
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