Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 105
m is seen. 102 GILBERT BOY ENGINEERING WHAT IS IN THE SUN AND STARS? When the light from the stars is viewed in the spectroscope,the spectrum is crossed by dark lines exactly corresponding tothe bright lines mentioned above. These are called the Fraun-hofer lines, after their discoverer. If, in the… … 3 Fig. 155. A lighthouse lensFrom Aldons* Elementary Course of Physics, published by The Macmillan Go. LIGHTHOUSE LENSES Lighthouse lenses have at the center a comparatively thinlens and around this prismatic sections with greater and greaterangle toward the edge, (1) Fig. 155. Panels (2) made up…
Light · Scientific recreations
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