Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 118
nce between the lenses. Is it equal to thesum of their focal lengths, that is, 8 -f- 4 = 12 inches ? Look at a distant object through the telescope with one eyeand outside the telescope with the other eye. Is the magnifi-cation equal to focallength of objective -f-focal length of eye-piece, that… … 116 GILBERT BOY ENGINEERING
Light · Scientific recreations
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