Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 115
a largerscale in No. 2, where m is the mirror, s and s two centre-screws whose points constitute the pivot round which thelever turns, e is a small counter-weight, t t is the cross-piece to which the magnifying apparatus is attached. Anaked section of the apparatus is also given in No. 1,where i is… … Willi Lwlillui tilli111 Lbct. iv. MATERIAL THEORY OF EXPANSION. 91 end resting upon the top of the lead bar at y. Fromthe end, l, of the lever the steel fibre passes round the axis,a, of the mirror m. Thus the effect is multiplied, first bythe lever, and then by the angular motion of the mirror.…
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