Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 26
al candles just 2 feet from the screen,and place an object in front of the screen as in Fig. 33. Are theshadows of equal darkness? If the candle flames are all of the same size, the shadows areequally dark because each light illuminates the shadow producedby the other and because the candle at 1… … 24 GILBERT BOY ENGINEERING candle 1 foot from a screen(see Fig. 34, illustrating shad-ow photometer), stand a pen-cil in front of the screen, andmove the lamp back and forthuntil the two shadows areequally intense. Measure thedistance from the screen tothe lamp. If this is 2, 3, 4, orA}/2 feet, the…
Light · Scientific recreations
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