Lectures on light, delivered in the United States in 1872-'73; with an appendix (1873)
Tyndall, John, 1820-1893 · New York, Appleton · leaf 149
e cone, and cutting off the light, a moments expos-ure of the pile at the marked point produces a violentdeflection of the needle. (See Fig. 23, where m m isthe mirror, P the pile, and T the opaque solution.) This beam of light now enters a riorht-anjrledprism and is reflected at the hypothenuse,… … of invisible images by lenses and mirrors may also bedemonstrated. Concentrating the beam, and cuttingoff the light, at the dark focus the carbon-points burntheir images through a sheet of black paper. Placinga sheet of platinized platinum at the focus, when theconcentration is strong an…
Optics
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