Fig. 182. PRINCIPLE OF REFLECTING GALVANOMETER.
Fig. 183. REFLECTING GALVANOMETER.
Galvanometer, Reflecting.
A galvanometer the deflections of whose needle are read by an image
projected by light reflected from a mirror attached to the needle or to
a vertical wire carrying the needle. A lamp is placed in front of the
instrument facing the mirror. The light of the lamp is reflected by the
mirror upon a horizontal scale above the lamp. An image of a slit or of
a wire may be caused thus to fall upon the scale, the mirror being
slightly convex, or a lens being used to produce the projection.