Westonn.
/ˈwɛst(ə)n/, U.S. /ˈwɛst(ə)n/ 1. attributive and in the genitive. Designating a primary cell with a very low variation of voltage with temperature, used as a standard voltage source for calibration purposes.The Weston cell has a cathode of mercury, an anode of cadmium amalgam, and an electrolyte of cadmium sulphate.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > galvanism, voltaism > [adjective] > primary > relating to
platinum-zinc1840
Smee1852
Weston1895
zinc-air1970
the world > matter > physics > electromagnetic radiation > electricity > voltage > photovoltaics > [adjective] > cell
Weston1895
photronic1932
1895 Sci. Progress 3 320 (title) Preparation of Weston's cell.
1897 Proc. Indiana Acad. Sci. 1896 98 We also made a number of Weston cells similar to the Clark.
1912 Rep. Internat. Comm. Electr. Units & Standards (U.S. Bur. of Standards) 181 The value 1.0183 recommended by the committee for the Weston Normal Cell.
1922 J. W. Mellor Comprehensive Treat. Inorg. & Theoret. Chem. I. xvi. 1029 In Clarke's cell, mercury deposits and zinc dissolves; in Weston's cell, mercury deposits and cadmium dissolves.
1959 I. Estermann Classical Methods I. vi. 272 The energies obtained by electrical measurements..are commonly expressed in international joules, units based upon the Weston standard cell of emf.
1972 Physics Bull. Jan. 40/2 The Bureau is..interested in the Josephson effect for possible use in electrical standards, although for the moment the standard Weston cell is preferred for convenience.
2001 S. A. Dyer Surv. Instrumentation & Measurem. 68/1 National metrology laboratories still possess material standards such as Weston cells and 1 Ω resistors for their electrical measurements.
2. attributive. Photography. Designating a system of film speeds based on exposure meters originally made by the Weston Electrical Instrument Company; designating a film speed expressed according to this system (also as postmodifier). Now historical.
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society > leisure > the arts > visual arts > photography > action of taking photograph > technical factors > [adjective] > speed systems
Scheiner1900
Weston1933
1933 Amer. Photogr. Sept. 566/1 According to the Weston rating, 16 is the plate speed for panchromatic emulsions.
1935 W. D. Morgan & H. M. Lester Leica Man. iv. 101 Their speed rating in daylight is 23° Scheiner or 24 to 32 Weston.
1972 K. C. Lahue & J. A. Bailey Glass, Brass, & Chrome vi. 99 A film rated at Weston 64 was twice as fast as a film rated at Weston 32, a difference of one lens stop.
1995 R. White Discovering Cameras (2001) i. 6 At first several film speed standards were in use such as Weston, the German DIN,..Ilford Speed Groups and so on.
2007 H. M. Grierson tr. H. M. Raimondo-Soulo Motion Picture Photogr. xxiv. 209 The first [emulsion] had a speed of about 8 Weston and was destined for shooting outdoors.
This entry has been updated (OED Third Edition, June 2011; most recently modified version published online December 2021).
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n.1895