Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 63
60 GILBERT BOY ENGINEERING … ored glass. When youlook through the tubeand revolve it, thecolored pieces of glassmake beautiful twelve-sided figures by mul-tiple reflection. Illustrate the work-ing of the kaleidoscopeas follows : Draw two Fig. 89. You see many twelve-sided figures lines at an angle of 30° on a piece of white…
Light · Scientific recreations
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