One of the mysteries of the English language finally explained.
1Attributive and in the genitive. Electricity. Designating a primary cell with a very low variation of voltage with temperature, used as a standard voltage source for calibration purposes.
2Attributive 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 Designating a system of film speeds based on exposure meters originally made by the Weston Electrical Instrument Company; designating a film speed expressed according to this system (also as postpositive). Now historical.
Late 19th century. From the name of Edward Weston, English-born electrical engineer.
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