Austin, Louis W. (Louis Winslow), 1867-1932, Thwing, Charles B. (Charles Burton), 1860-1946, joint author · Boston, Allyn and Bacon · leaf 49
crum, F, of our\ever, the third being attached to the heavy brass ring R.The bar is kept in a constant position on the points bymeans of shallow conical holes at H, P, P. To preventlateral motion, the wire passes loosely through a small hole 36 PB rSK AL MEASUREMENT. in the plate, M. To the lower… … Fig. 11a. r the length of the short arm of the lever, R the distancefrom the mirror to the scale; then, by geometry, — B::l:r. To Adjust the Telescope and Scale. — First approachthe mirror, and, looking into it, determine in what direc-tion it is pointed, and adjust it so that it shall face…
Physics
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