Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 20
ccur: 1st. It may be reflected ;2nd. It may be absorbed ; or,3rd. It may be transmitted. Note.—It may be partly reflected and partly absorbed, partly absorbedand partly transmitted, or partly reflected and partly transmitted. REFLECTION. 25. The rays of heat, like those of light, may be collected… … direction ; and if these i)arallel rays be made to impinge upon asecond concave parabolic reflector (B), they become convergentand are reflected to a focus (D.). If a screen be interposedbetween the mirrors and some phosphorous be placed at P, uponwithdrawing the screen the phosphorous instantly…
Physics
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