Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 874
a cylindrical form, and with two snugs at the middle of theirlength, which, entering corresponding recesses in the plumber-block, retain them securely in their placeswhen the cover is fixed. By this arrangement they are more easily fitted, contain less useless metal,and have a lighter appearance.…
Mechanical engineering · Mechanics · Engineering
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