Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 106
vely thinlens and around this prismatic sections with greater and greaterangle toward the edge, (1) Fig. 155. Panels (2) made up inthis way are placed completely around the light F (3). Thisgives a large, short focus lens which does not absorb as muchlight as a solid thick lens would absorb. LENSES…
Light · Scientific recreations
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