Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 308
Light Modifier. Iris Diaphragm. others require illumination as nearly vertical as possible.Experience will soon indicate the right magnification fordifferent objects. This may be varied by taking off or put-ting on the lower half of the objective, also by drawing outor pushing in the draw tube. For… … Sub-Stage Condenser. ment than that already described will be needed. Themicroscope shown in Fig. 296 is perfectly adapted for gen-eral use. The main tube has two draw tubes by which anydesired tube length may be secured. The coarse adjust-ment is effected by means of a rack and pinion; and a 286…
Physics · Lantern projection · Electric apparatus and appliances
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