Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 119
four mirrors were employed. His idea may be repre- *£. .>_ sented by a wire one meter long so bent that its endsare much less than onemeter apart. In an illus-tration of a field-glass asmanufactured at the ZeissWorks, on the Porro prin-ciple, it will be remarkedthat the entering ray >k * A k… … Prisms for Zeiss binocular glasses. than that of an ordinary glass, while as the two images receivedfrom the two eye-pieces differ more than those observed in directvision, the perception of depth is increased in a notable degree.This construction is adapted to sporting, marine, and opera-glasses,…
Inventions · Inventors
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