Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 55
52 GILBERT BOY ENGINEERING … (Fig. 75). Doyou find many,many lights? E x p e r i mentNo. 43. Magicarmy. Put anumber of leadsoldiers on a nar-row strip of pa-per and drawthem between the Fig. 75. You see many lights vertical mirrors (Fig. 76). Do yousee an immense army marching in perfect order? Experiment No. 44. Magic…
Light · Scientific recreations
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