Download A history of light and colour measurement: science in the by Sean F. Johnston PDF

By Sean F. Johnston

Imagine that brightness of sunshine is not any vast deal? re-examine. :-)

With bankruptcy titles like bankruptcy 2's "Light as a Law-Abiding Quanitity" or bankruptcy 3's "Seeing Things", this e-book has as a lot center because it does wit.

Intelligently written, it offers a tremendous counter-weight to all flights of fancy (successes--Plank's Black physique Radiation--and failures--N Rays! lol) in addition to their public belief.

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Buchwald J Z 1985 The Rise of the Wave Theory of Light (Chicago) pp 45–8. Malus observed qualitatively that the brightness of light refracted through a crystal of Iceland spar varied in a complementary way to that of the reflected component as the crystal was rotated. Assuming the total intensity to be conserved, he deduced that the reflected component was proportional to the cosine of the angle squared and that the refracted component was proportional to the sine of the angle squared. Talbot H F 1834 ‘Experiments on light’ Phil.

The disjointed status of the emerging subject is reflected in the heterogeneous case studies and issues discussed in this chapter. But to discuss quantitative measurement we must adopt definitions. Among the clearest analyses of quantification were those devised by the physicist and philosopher of science Norman Campbell (1880–1949). Having a strong personal stake in light measurement, Campbell in 1928 cited photometry as a study still suffering from inadequate foundations, an evaluation common to his generation1.

Note 2. See also Perrin F H 1948 ‘Whose absorption law’ JOSA 38 72–4. 5 d’Ortous de Mairan J J 1721 M´em. Acad. R. Sci. Paris 8–17. 6 See Ariotti P E and Marcolongo F J 1976 ‘The law of illumination before Bouguer (1729): statement, restatement and demonstration’ Ann. Sci. 33 331–40. 7 Middleton op. cit. note 2. Criticizing the observations of Huyghens (p 46), Bouguer wrote: ‘apart from the fact that this clever mathematician may not have made all the necessary distinctions between the total quantity of light and its intensity, it is only too certain that we can only judge directly the strength of two sensations when they 28 Light as a Law-Abiding Quantity 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 affect us at the same instant.

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