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

By Sean F. Johnston

Imagine that brightness of sunshine is not any monstrous deal? reconsider. :-)

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

Intelligently written, it offers a huge 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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Soc. 84 67–82. Guillemin A 1868 Les Ph´enom`enes de la Physique (Paris) p 272 (my translation). 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.

Thus the hesitancy of researchers to adopt quantitative methods in late Victorian photometry can be attributed in part to the lack of assurance in the validity of this approach—in short, it did not appear to work well and had dubious relevance. Comprising an inchoate collection of techniques and usages in the mid 19th century, photometric practice was, a few decades later, striving for numerical expression. 1. RECURRING THEMES Interest in the quantitative measurement of light intensity increased in the second half of the 19th century owing to the creation of new research problems, especially in the areas of astronomical and lighting photometry.

His interest was provoked by reading a paper by John Michell in 1767 proposing to measure the distance of stars by their brightness31. Michell knew of Bouguer’s earlier work in light measurement, and had devised a crude photometric method: enquiring how far away the sun would have to be to appear as bright as a typical star, he used Saturn as a reference. e. illuminated face-on as seen from the Earth) was as bright as a first-magnitude star. Its intermediate brightness, directly linked to the dazzling light of the sun, made it a convenient photometric ‘stepping stone’ to relate solar and stellar brightness.

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