Walsh, David · London : Baillière, Tindall and Cox · leaf 29
ely upon its axis.This instrument indicates in volts thepressure of the flow of the electriccurrent. The ammeter is similar inconstruction, except that the bobbinis made of a much larger wire. Itindicates in amperes the rate of theflow of the electric current. Behindone end of the magnetic needle… … Fig. 6.—Voltmeter andAmmeter. above the other on the(Fig. 6). Another way of testing the cell is by means of a hydrometer.The specific gravity of the acid when put into the cell is about1*190, and when fully charged about 1*200. A convenient hydro-meter for testing sealed cells has been introduced…
X-rays · Radiography
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-270-143.webp)
