Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 285
institution inthe world. In manufacturing modern tools and machinery, the thousandthof an inch is the usual limit of allowable error. A micrometercaliper measuring to this limit is here shown.The pitch of its screw is 40 to the inch, andthe beveled edge of the screw-thimble is dividedinto 25 parts,… … Micrometer caliper measuring 1-1000 inch.Brown & Sharpe, Providence. detected. The production of a screw such as this was simplyimpossible by the lathe as used almost up to the close of theeighteenth century, its operator holding in his hand a gouge orchisel. Of inestimable importance was Henry…
Inventions · Inventors
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