Download A History of Light & Colour Measurement: Science in the by Sean F. Johnston PDF By Sean F. Johnston It is a heritage 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 law, might be commonplace not just of twentieth century technological know-how, yet of its destiny.

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33 Bouguer op. cit. note 2, reported that the Swedish astronomer Celsius had used a similar method based on printed slips or black and white patterns. Geminiano Montanari, of the University of Bologna, published a comparable method in 1676; see Ariotti op. cit. note 6 332, 338. The idea of reading text as a means of determining a threshold of intensity was current until at least the turn of the 20th century. 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.

His motive for developing a system of colour specification had initially been to investigate complaints from a customer about the fading of the colours of dyed fabrics52. Such systems proliferated by the turn of the century and fulfilled a practical need. For example, Robert Ridgway, Curator of Birds at the US National Museum, published his own Nomenclature of Colors for Naturalists in 1886. La SocietC Franqaise des ChrysanthCmistes published its Repertoire des couleurs in 1905 to describe flowers, but the catalogue found widespread use in other domains.

This was a device in the form of a telescope incorporating an adjustable aperture wheel and graticule with scribed letters. The appropriate aperture, calibrated in terms of intensity, was selected to make the smaller letters illegible while the telescope was pointed at the light source of interest. 30 On Herschel's novel astronomical style, see Schafer S 1981 'Uranus and the establishment of Herschel's astronomy' J. Hist. Astron. 12 11-26. 31 Michell J 1767 'An inquiry into the probable parallax, and magnitude of the fixed stars, from the quantity of light which they afford us, and the particular circumstances of their situation' Phil.

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