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Scientific American, Vol. 69, No. 20 (November 1893) (1893)
leaf 4
ance actuaries all over the world use mechanical in detail in Figs. 3 and 4, has a segmental valve same pattern are interchangeable. The machine is apvJliances of various kinds to perform their arith- seat, and the valve is held on a shaft extending therefore well suited to its work, and as the… … Como, who writes: " I think this PELT'S COMPTOMETER. common differences, particularly for © 1893 SCIENTIFIC AMERICAN, INC.Columbian · Machine · Munn · Valve · Scientific American · Device · Light year · Letters patent · Gas engine · Square foot · Sewing machine · Sheet metal · Gas engines · Otto gas · Focal length
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