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Title: Six electric lamps used from 1909 to 1940 as secondary stand [Go to resource]
Description: Six electric lamps used from 1909 to 1940 as secondary standards for photometric comparisons, (These lamps were originally calibrated by reference to the 10-candle Vernon Harcourt pentane lamps) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1965-87 Go to resource More Like this...
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