Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 157
537. RAMELLI ROTARY PUMP.—One of the earliest (1588). A slotted cylinder with fourwings eccentric to a cylindrical shell. The wingsare pushed out by helical springs. … 538. HEPPEL ROTARY PUMP. —Four wings are jointed concentric with the cylindrical^ shell. A disc and shaft are set eccentric to thecylindrical shell. The wings are linked to theeccentric disc as shown, so that the wings on theupward stroke move faster than the wings movingdownward on the opposite…
Mechanical movements
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