Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 517
Fig. 385. If a beam of light from a lamp in a dark room be thrownupon the mirror and reflected thence to a screen, S, a spot of … Pig. 386. light thereon will show the slightest change in the positionof the mirror-needle in the coil. Hence a very feeble current TANGENT GALVANOMETER. 497 declares its presence by causing the spot of light to move toone side or the other of a central or zero point where the spotfalls when there…
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
