Iles, George, 1852-1942 · New York, H. Holt and company · leaf 446
ninjector does all the work of an elaborate pump. BENJAMIN C. TILGHMAN 385 simple tube; in some cases it is preferable to employ a tubewith a long, narrow orifice. How does sand, whether falling by gravity or impelled bya steam jet, exert so rapid an effect? First of all, we mustchoose sharp,… … Etching with Sand from a Hopper finest grains he can get. A foundryman, who wishes toscour stove-castings, takes the coarsest grains to be had.Whatever its size, sand in a blast neither cuts, grinds, norabrades the surface it strikes. To compare small thingswith large, the grains act much as…
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