Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 404
e arch.Rubble arches are built of smaller stones, generally roughly dressed to the wedge shape. Theyshould be built in mortar of good quality, as they depend greatly upon its coherence for their strength.Joints and Connections.—There are several methods of giving additional strength to the joints…
Mechanical engineering -- Dictionaries
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