Gilbert light experiments for boys . 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 paper. Stand the mirrors on a block abovethese lines with the angle toward a good light (Fig. 89). Nowput pieces of colored paper and other small objects on a stripof paper and draw the paper under the angle, while you lookdown between th
Gilbert light experiments for boys . 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 paper. Stand the mirrors on a block abovethese lines with the angle toward a good light (Fig. 89). Nowput pieces of colored paper and other small objects on a stripof paper and draw the paper under the angle, while you lookdown between the mirrors with your eye near the angle. Doyou see a series of twelve-sided figures? ILLUSIONS The Sphinx. Thisillusion shows anEgyptian head with-out a body (Fig. 90).The hypnotist showsthe audience an emptybox with a glass closes and locksthe door over thefront, places the boxexactly on the centerof the table, unlocksit, opens the door, and,
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation
