Download e-book for kindle: A history of light and colour measurement: science in the by Sean F. Johnston

By Sean F. Johnston

ISBN-10: 0750307544

ISBN-13: 9780750307543

Imagine that brightness of sunshine is not any substantial deal? reassess. :-)

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 center because it does wit.

Intelligently written, it presents a major 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 resources for A history of light and colour measurement: science in the shadows

Example text

In a thresholding or extinction technique, the observer compares the intensity to a minimum detectable level. The intensity is reduced by some means until it is below the threshold of visual detection. The amount of reduction required is then a measure of the relative brightness. Airy’s ‘candle versus sun’ technique for determining the intensity of the eclipsed sun adjusted the apparent intensity of the candle flame (the reference) by changing its distance relative to the disc of the sun until the flame disappeared.

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. Setting aside his judgements for the time being, we can nevertheless profit from his categorizations of quantification.

The emerging quantitative attitude was shared by the American Samuel Langley in the description of his new bolometer: I therefore tried to invent something more sensitive than the thermopile, which should be at the same time equally accurate,— which should, I mean, be essentially a ‘meter’ and not merely an 37 A History of Light and Colour Measurement indicator of the presence of feeble radiation. The distinction is a radical one. 11 Practitioners now labelled the obtaining of an indication of light intensity as inferior to a measurement, in contrast to Airy’s notion/measure equivalence of a quarter-century earlier.

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

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