Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 44
ver the Bopening*. Use blackbackgrounds behind Aand B; this is impor-tant. You should alwaystry out your appa-ratus just before youuse it. Look at thewindow glass from Fig 69 How you arrange glass> book> pictures,the audience side, have and candles both lamps lighted, and the boy A will… … Fig. 70. How to make a magic boxFrom Magical Experiments, published by David McKay Co., Philadelphia 42 GILBERT BOY ENGINEERING Now have an assistant turn down lamp 1 and A will dis-appear, turn up lamp 1 and A appears again. Also turn light2 down and up and B disappears and reappears. These shows…
Light · Scientific recreations
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