Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 269
Ancient Egyptian balance.219 220 MEASUREMENT of Hunnafer, who lived in Egypt thirty-three centuries ago, wehave pictured a well-constructed balance of equal arms, in whicha feather is outweigfhir.s a human soul. In its successive im- … A Rueprecht balance. provements the balance registers the progress of many arts andsciences, and in its turn has promoted them all. It must be builtof a metal, or an alloy, hard, durable, and not easily corroded.Its centre of motion should be a little above its centre of gravity;its knife edge…
Inventions · Inventors
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