By Sean F. Johnston
Imagine that brightness of sunshine isn't any huge deal? re-examine. :-)
With bankruptcy titles like bankruptcy 2's "Light as a Law-Abiding Quanitity" or bankruptcy 3's "Seeing Things", this ebook has as a lot middle because it does wit.
Intelligently written, it offers an enormous 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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Extra info for A history of light and colour measurement: science in the shadows
Such ‘acuity’ devices, based on the faculty for discriminating small details in patterns, were a class of photometers unique in that they did not rely on an observation of intensity. 34 Heyde’s Aktinophotometer of 1905; see Thomas D B 1969 The Science Museum Photography Collection (London) p 37 catalogue no 267. —I. The work of Herschel and his contemporaries’ Ann. Sci. —II. The work of Melloni and his contemporaries’ Ann. Sci. 3 (1938) 402–16; see also Barr E S ‘The infrared pioneers—I. Sir William Herschel’ Infr.
One of the most successful of these was the ‘Tintometer’ invented by Joseph Lovibond (1833–1918), a former English brewer54. Based on the comparison of the coloured sample to a graded set of glass filters, the Tintometer found use in industries as diverse as steel production, water quality measurement and the valuing of flour. Such early applications had a strongly empirical basis. Although Lovibond spent several years investigating schemes of colour matching, he had no time for theorizing. He confined himself to empirical experiment, which ‘enabled the author to devote much of his time and energy to actual work, which would otherwise have been employed in profitless controversy’55.
As he noted, there was no general agreement on the adequacy of photometry for any purpose. Talbot’s method, related to persistence of vision, sought to redress the difficulties. Recalling that a glowing coal whirling around appears as a continuous circular ring (an observation made by Isaac Newton, if not earlier), he reasoned ‘that time may be employed to measure the intensity of light’ (emphasis in original). To do so, a light source would repeatedly be eclipsed by a rapidly rotating wheel having one or more sectors cut away.
A history of light and colour measurement: science in the shadows by Sean F. Johnston