illuminometern.
/ɪl(j)uːmɪˈnɒmɪtə/ A photometer, esp. one for measuring the illumination of surfaces (rather than the intensity of light sources).
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the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun] > degree of intensity > instrument
photometer1779
photoscope1872
spectrophotometer1881
light meter1889
Hefner1891
illuminometer1895
luxmeter1910
lumeter1911
telephotometer1915
1895 Houston & Kennelly in Operator & Electr. World 9 Mar. 309/2 The question at issue is..the degree of illumination actually produced, and this question cannot be decided by the photometer, but requires the use of an illumination measurer or illuminometer.
1895 Houston & Kennelly in Operator & Electr. World 9 Mar. 310/2 We call our instrument an illuminometer and have filed applications for a patent on the same.
1908 Illuminating Engineer I. 714/2 It was proposed to use it [sc. Houston and Kennelly's photometer] for candlepower photometry as well as for the measurement of illumination. The unfortunate name ‘illuminometer’ was given to the instrument, and..this mongrel word is sometimes used at the present day.
1953 R. E. Kirk & D. F. Othmer Encycl. Chem. Technol. XI. 326 The luminous intensity of the flame..can be measured by an illuminometer consisting of a barrier-layer photocell connected to a micro-ammeter.
1971 Jrnl. Gen. Psychol. 84 125 Exposure times of 40, 150, and 3500 msec and luminances of three and 30 fc, as read with a Macbeth Illuminometer, were employed.
This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2018).
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n.1895