Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 103
wels. If all the importantwheel bearings have these minerals, the watch issaid to be full-jeweled. The jewels are held inplace by screws so small as to be almost invisiblewithout the aid of a microscope. Very smallscrews are also used in other parts of the watch. Ask some one you know to let you… … THE UNDER SIDE OF THE BALANCE-WHEEL. This regulates the speed (Magnified about five times.) machinery of a watch from which he hasmoved this outer plate, and to explain it to re-you. NATURE AND SCIENCE FOR YOUNG FOLKS 73
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