Download PDF by Sean F. Johnston: A History of Light & Colour Measurement: Science in the

By Sean F. Johnston

ISBN-10: 0750307544

ISBN-13: 9780750307543

It is a background of the hidden workings of actual technological know-how - a technical endeavour embedded in a social context. It argues that this 'undisciplined' topic, straddling academia, trade and legislation, should be ordinary not just of twentieth century technological know-how, yet of its destiny.

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Extra resources for A History of Light & Colour Measurement: Science in the Shadows

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2. Astronomy: isolated forays Nineteenth century astronomers weighed up the measurement of light as diffidently as did photographers. While there were potentially a number of applications-determining stellar magnitudes, the brightness of variable stars, A History of Light and Colour Measurement and eclipse phenomena, for example-none of these practices was central to the main concerns of astronomy at that time and only isolated cases of interest can be found. William Herschel, who brought a quantitative point of view to astronomy as he was later to bring to the study of radiant heat, was one such case3'.

See Debus A 1962 'Solution analyses prior to Robert Boyle', Chymia 8 41-61 and 'Sir Thomas Browne and the study of colour indicators' Ambin. 10 30. 54 Lovibond J W 1897 Measurement of Light and Colour Sensations (London). 55 Lovibond J W 1915 Light and Colour Theories (London) p 3. 56 Campbell N R 1928 An Account of the Principles of Measurement and Calculation (London) p 1. See also chapter 3. CHAPTER 3 SEEING THINGS Late Victorian photometry was shaped by new players wielding new devices and seeking new goals: gas inspectors and astronomers with practiced eyes or sensitive emulsions.

La SocietC Franqaise des ChrysanthCmistes published its Repertoire des couleurs in 1905 to describe flowers, but the catalogue found widespread use in other domains. Numerical languages for colour met the requirements of commercial specification. Such systems were characterized by a certain rigidity of definition coupled with empirical details. The number of hues might be 10 (Munsell) or 36 (Ridgway) values; the number of grey levels, 6 , 9 or 15; the number of colours defined, typically several hundred to a few thousand.

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A History of Light & Colour Measurement: Science in the Shadows by Sean F. Johnston

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