Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 121
118 GILBERT BOY ENGINEERING … I Fig. 179. Binoculars Courtesy of the Scientific American the diverging lens in the other ring holder and wind a tube2 inches long. Insert the second tube in the first and your operaglass is made. Focus it on a distant object. The Prism Binoculars (Fig. 179) are made with lenses sim-ilar to those…
Light · Scientific recreations
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