Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 232
d. It produces a laterally ex-panded image of a narrow picture, and while the convexcylindrical mirror disperses the light from a distant source,the concave mirror renders it convergent; but, as in thecase of the water bulb, the reflected rays do not focus at asingle point, but cross each other,… … St^^^M^■\iX
Physics · Lantern projection · Electric apparatus and appliances
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