By Sean F. Johnston
Imagine that brightness of sunshine isn't any great deal? reassess. :-)
With bankruptcy titles like bankruptcy 2's "Light as a Law-Abiding Quanitity" or bankruptcy 3's "Seeing Things", this booklet has as a lot center because it does wit.
Intelligently written, it offers a big counter-weight to all flights of fancy (successes--Plank's Black physique Radiation--and failures--N Rays! lol) in addition to their public notion.
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Additional info for A history of light and colour measurement: science in the shadows
Avec une Relation Abr´eg´ee de ce Voyage (Paris). , p 209. Ibid. Bouguer’s biographical details are from the translator’s introduction and from DSB vol 2, 343–4. Lambert J H 1760 Photometria Sive Mensura et Gradibus Luminis, Colorum et Umbrae (Augsburg). Abridged German transl. Anding E 1892 in Ostwald’s Klassiker der exakten Wissenschaften, nos 31, 32 and 33 (Leipzig). See Bouguer op. cit. note 8 vol III p 57. R Smith’s 1738 A Compleat System of Optiks in Four Books (Cambridge) was translated into German in 1755.
Unsurprisingly for the study of invisible radiations, research was centred on non-physiological detectors. While Herschel’s ‘radiant heat’ was detectable by the skin, the radiation detector he used from 1800 was a sensitive thermometer38. And from the beginning there was no question but that it was quantifiable: his first experiments recorded not the presence of this radiation, but the temperature change it produced in his thermometers. In the following decades, Herschel’s sensitive thermometers were joined by detectors exploiting electrical phenomena dependent on heat.
Instead of a fundamental interest in light, the photographer had an interest merely in its control as an exposing agent. The control of light was straightforward, in principle, for most photographic work: the intensity could be varied over wide limits simply by altering the aperture of the camera lens. But early cameras had little need for adjustable apertures: there was always too little light available. Light intensity was largely an uncontrollable factor in photography, as artificial lighting was generally too weak for exposure.
A history of light and colour measurement: science in the shadows by Sean F. Johnston