Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 273
1045. FOUR-BOLT CAM PLATE, usedfor throwing safe bolts and for expanding dies. … 1046. EQUALIZING TENSION SPRING ANDLEVER.—The bell-crank lever equalizes the tension ofthe spring by its varying position. Its long arm is on afixed pivot.
Mechanical movements
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