Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 363
much on the careful prepara-tion of the plate. Occasionallv, a buff would in some manner receive par- FiG. 323. … The Rotarv Buff. tides of matter which would cause it to scratch the plate.The remedy consisted in scraping the face of the buckskin,and brushing it thoroughl} with a stiff bristle brush, gen- FiG. 324.
Physics · Lantern projection · Electric apparatus and appliances
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