St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 59
o readings in volts andamperes gives the number ofwatts. 78. Chemical Meters alsomeasure the quantity of cur-rent that is used; for example,one may be placed in the cellarto measure the quantity of current used to light thehouse. Fig. 76 shows a chemical meter, a part of the currentpassing through… … Fig. 74-
Electricity
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