Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 307
he tray on the table. A little caution as to illumination is necessary, as thebeginner is generally unsparing of his eyes, using far toomuch light. A blue glass screen placed between the mirrorand source of light, or between the mirror and the stage,modifies the light so as to greatly relieve the… … A Modern Microscope. ney by a wire, as shown, forms a very desirable shade.Most objects viewed by transmitted light in an instru-ment of this class require an absolutely central light, that is, * Bausch i: Lomb Optical Co.s Universal. MICROSCOPY. 285 the light must be reflected straight upward…
Physics · Lantern projection · Electric apparatus and appliances
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