Hill, John A. (John Alexander), 1858-1916, Sinclair, Angus, 1841-1919 · New York : American Machinist Pub. Co · leaf 819
MOTIVE ENGINEER. [September, 1891 Some »w nriu4]itiu: Mafliinc!*. The engraving on this page show Ihivc forms ofa new bdcI nniqui? grinding device being pliieed onthe market by Pedrick A Ayer, of Philtidelphiu. They are built on n new principle entirely, andhave the great advantitge of simplicity.… … ilie one usually employed for grinding niiii-h ii-iliop tools. It li&M two emery wheels, the shiilrunning through removiible bronze bushings in ihhead. The lank is lllled at the lop. andwater turned u|hiu the Hione near the etnler.It remains upon the stone ^y eoptllury nl-inution until enough…
Railroads · Locomotives
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