Emerson, William, 1701-1782 · London : Printed for J. Nourse · leaf 121
I Sf^pd.ioS. … r. Sea. V. THE CRANE. 107 Fig. 6^. is a fort of crane, BC an upright poft, Fig.AB a beam fixed horizontally at top of it; thefe 63.turn round together on the pivot C, and withinthe circle S, which is fixed to the top of the framePQ. EF is a wooden roller, or rather a rollermade of thin boards, for…
Mechanical engineering
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