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 585
kind of metallic packing, but when properly fitted up, itpossesses nearly all the advantages of the more complicated descriptions; the only disadvantage beingthe necessity of occasional adjustment, when the internal hemp gasket loses its elasticity, the frequencyof which depends upon the accuracy… … Ill H Scalu.—1 inch=l loot. of the steam itself. Another form consists of a single ring with a tongue joint, as shown in tinfigure. Closely allied to the above is what we may term the second variety of this species, an externalpacking rin like the former, but deriving its tightness from its own…
Mechanical engineering · Mechanics · Engineering
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