Brown, William Norman · London, Scott, Greenwood & Son; New York, D. Van Nostrand Co.; [etc., etc.] · leaf 26
, so that the ray of light must pass through it. The prism, we may remark, is a stalk of clear flint glass, a few inches in length, and of a triangular section, as at Fig. 12. It is fixed behind the aperture through which the ray Fig. 12.— Prism. enters, so that its refracting angle is uppermost… … Fig. 13. — Solar Spectrum. on the opposite wall, this spectrum being a vertical band of coloured strips of the varied colours of the rainbow. This solar spectrum is a band (Fig. 14) consisting of a very large number of different tints, amongst which, however, it is easy to distinguish seven…
House painting
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
