Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 185
irror is provided with a stand formedof a base and two uprights. The wood screws projectthrough the uprights, and are provided with wooden nuts. To facilitate the experiments to be performed with theconcave mirrors, two or three small stands are required. Itis desirable that these stands be made… … Reflection and Concentration of Sound. a short column, as shown in the engraving. A paper trum-pet, 8 inches in diameter at the larger end and 2 feet inlength, is useful, and a rubber tube having a sinall funnelat one end and an ear piece at the other end is necessary. To show the concentrating…
Physics · Lantern projection · Electric apparatus and appliances
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