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, could be general not just of twentieth century technological know-how, yet of its destiny.
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Additional resources for A History of Light & Colour Measurement: Science in the Shadows
As early as 1899, Karl Schwarzchild (1873-1916), then an observatory assistant in Vienna, developed techniques for combining spectroscopy with photographic photometry. These allowed the relative intensity of a star to be mapped as a function of wavelength, by applying the photometric method successively to narrow bands of wavelengths3'. From this colour information, experimentalists could classify stars by type, and theorists were able to estimate temperature31. Stellar classification, based on spectral lines and photometrically determined temperatures, became a major activity in astrophysics32.
From this colour information, experimentalists could classify stars by type, and theorists were able to estimate temperature31. Stellar classification, based on spectral lines and photometrically determined temperatures, became a major activity in astrophysics32. The isolation of the observing communities diminished as the number of practitioners grew. Hans Rosenberg (1879-1940), for example, began working with Schwarzchild around 1907, where he analysed spectrograms using a Hartmann microph~tometer~~.
Sci. 3 402-16. 44 Brush S G 1970 'The wave theory of heat: a forgotten stage in the transition from the caloric theory to thermodynamics' BJHS 5 135-67. 45 For a discussion of the effects of these radiations on selenium, see Hempstead C 1977 Semiconductors 1833-1 919: an Historical Study of Selenium and some Related Materials (unpublished PhD thesis, Durham University) pp 34-5. 46 Hendry J 1986 James Clerk Maxwell and the Theory of the Electromagnetic Field (Bristol); Buchwald J Z 1994 The Creation of Scientijic Effects: Heinrich Hertz and Electric Waves (Chicago).
A History of Light & Colour Measurement: Science in the Shadows by Sean F. Johnston