SIEMEN'S UNIVERSAL GALVANOMETER.
SIEMEN'S UNIVERSAL GALVANOMETER
Measuring Electrical Resistances.—For this purpose the instrument is arranged as a Wheatstone's balance. The connections are made as shown at Pl. xxiv., [Fig. 1] and [5], where X is the unknown resistance.
a.—The needle i is to be brought to the zero point of the small cardboard scale by turning the galvanometer G round its vertical axis, taking care that the needle moves with perfect freedom.
b.—The pointer or vernier Z is to be brought, by means of the handle g, to the zero point of the large scale on the slate disc.