Torpedoes and Torpedo Warfare / Containing a Complete and Concise Account of the Rise and Progress of Submarine Warfare

by Charles William Sleeman

where n is the resistance of the battery E₀.

The electromotor E₂ is now to be inserted in the place of E₁, and the galvanometer needle, when it deflects, again brought back to zero by moving the pointer Z. If for instance the pointer has to be pushed to 40° on the B side to obtain equilibrium we have—

E2 = E0	150 - 40	. . . . . . . . (2).
	300 + n

By eliminating n from equations 1 and 2 we have

E₁ : E₂ = (150 - 30) : (150 + 40) = 12 : 19 . . . . . . . . (3).

The two electromotive forces are in the same proportion as the two observed distances of the pointer Z from 150° on the A side of the instrument.

For measuring the Intensity of a Current.—For this purpose the instrument is simply used as a sine galvanometer. The connectionsare made as shown at Pl. xxiv., [Figs. 3a] and [7].

The manipulations a, b, c, and d same as in the second case.

e.—Connect one pole of a battery to terminal II. and put the other pole to earth.