The Manufacture of Light


    PROF. THOMPSON'S evening lecture delivered at the York meeting of the British Association in August last is here presented in an attractive form. Twenty-eight clearly reproduced illustrations assist greatly in a thorough comprehension of the discourse. After a brief description of primitive sources of light and a reference to the inventions of gas and electric lighting, the general question of incandescence is discussed. This is followed by an account of photometry and an explanation of the inequality in different directions of the light from various sources. After dealing with the sensitiveness of the eye to radiations of particular wave-lengths, the measurement of emission, and the temperature and quality of radiation, Prof. Thompson describes various incandescent gas-lights, new kinds of glow-lamps and arc-lamps, and concludes with a consideration of the cost of the manufacture of light. The little book should have a wide popularity.

    The Manufacture of Light.

    By Prof. Silvanus P. Thompson Pp. vi + 67. (London: Macmillan and Co., Ltd., 1906.) Price 1s. net.

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    The Manufacture of Light . Nature 75, 269 (1907) doi:10.1038/075269d0

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