Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 73
Fig. 107 (2) … Fig. 108. A searchlightCourtesy of the Scientific American GILBERT LIGHT EXPERIMENTS 71 Fig. 109. A parabolicreflectorFrom Black and DavisPractical Physics, publishedby The Macmillan Co. rays which are above the principal axisbefore they strike the concave mirror arebelow it afterward and vice…
Light · Scientific recreations
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