Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 60
ck, overlapping 1 inch on oneside. Paste the overlapping partstogether. Cut a hole 3 X 3 oppo-site the upper mirror and a hole2 X 2 opposite the lower mirror, and your periscope is finished. You can use this periscope in your trench battles; also youcan use it on a train to see forward without… … Fig. 86. You see four candles FUN WITH MIR-RORS AT DIFFER-ENT ANGLESExperiment No. 48. Mirrors at differentangles. Stand the mir-rors vertically and atright angles on thetable (Fig. 86) andplace a lighted candle 58 GILBERT BOY ENGINEERING between them. Do you see four candles, the real candle…
Light · Scientific recreations
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