Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 487
y, near Wellington, New Zealand, and in many other places throughout the world, flints have been found so beautifully and symmetrically polished that Sand-blast. they were at first believed to be products of art, yet nothing but wind-blown sand had given them form. Fifty years ago globes for gas… … Vacuum renovators for carpets and upholstery. greater B. C.of Phila-one da)noticed the muchworn touch-hole of a:old bronze cannon. He felt sure that the wear had been due noso much to outflowing gases as to bits of unburnt powder driveout at each discharge, identifying this abrasion with the…
Inventions · Inventors
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