Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 622
a drop ofsome of the essential oils. The oils of cinnamon, coriander,and lavender are examples. In Fig. 569 is shown the me-thod of projecting a piece of apparatus ; in the present case,a radiometer. The objective is removed from the lantern,and supported a short distance in front of it, and the… … Prnjecting the Spectrum. causes the radiometer to revolve, so that it is seen inmotion on the screen. In Fig. 570 is shown a simple device, known as theopeidoscope. It consists of a short paper tube, having athin piece of rubber stretched over it and tied. A smallpiece of mirror is cemented to the…
Physics · Lantern projection · Electric apparatus and appliances
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