By Sean F. Johnston
Imagine that brightness of sunshine isn't any giant 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 center because it does wit.
Intelligently written, it offers a tremendous 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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Extra resources for A history of light and colour measurement: science in the shadows
Soc. 9 73–88. Schrøder M 1969, transl. H Shepherd The Argand Burner: its Origin and Development in France and England, 1780–1800 (Odense). Keitz H A E 1955 Light Calculations and Measurements (Eindhoven) p 8. Brown G I 1999 Scientist, Soldier, Statesman, Spy: Count Rumford (Sutton). Thompson B 1794 ‘A method of measuring the comparative intensities of the light emitted by luminous bodies’ Phil. Trans. Roy. Soc. 84 67–82. Guillemin A 1868 Les Ph´enom`enes de la Physique (Paris) p 272 (my translation).
Some practitioners sought to improve the precision of their visual techniques and to trace the experimental factors that limited it. More commonly, however, scientists intrigued by the possibilities of photometry applied the technique unaware of its difficulties. In 1878, Charles Zenger reported a method of measuring the relative intensity of planetary discs and satellites: he noted the time of disappearance of planetary features near twilight9 . Zenger based his work on that of Bunsen (of prior fame in spectrum analysis) who had used a photographic technique to measure the background intensity of the sky versus the zenith distance of the sun, this serving as the reference for the threshold technique.
39 For later variants, see Cartwright C H and Strong J 1938 ‘Vacuum thermopiles and the measurement of radiant energy’ in Strong J 1938 Procedures in Experimental Physics (New Jersey). 40 Schettino E 1989 ‘A new instrument for infrared radiation measurements: the thermopile of Macedonio Melloni’ Ann. Sci. 46 511–17. Melloni also invented a device to display the temperature change caused by radiant heat as a coloured surface: see Melloni M 1850 La Thermochrose ou la Coloration Calorifique (Naples; reprinted in facsimile edition, Bologna, 1954).