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 948
or pistons are required. The rotary-piston meter is the invention of Benaiah Fitts, and manufactured by the Union Water-Meter Company of Worcester, Mass. Fig. 4241 represents the exterior of the apparatus, and Fig.4242 shows the working parts removed. The pistons are made in concentric circles and…
Mechanical engineering -- Dictionaries
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