A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 45
h 32 CLOCKS. … The wheel i has eight pins projecting from it,and these, in succession, raise the tail of the ham-mer as the rotation of the wheel brings them toit. When the hammer is discharged, or frees it-self from the pin, it is carried against the bell bythe spring z; u is called the counter-sprng, andis…
Encyclopedias and dictionaries · Aeronautics
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