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“In photometry (measure of light), a mounting for an incandescent lamp ... Rotator. The lamp to be tested is mounted upon a revolving spindle, ss, current being supplied through the brushes bb. The axis of rotation may be varied by turning the spindle about the horizontal shaft a.” -Whitney, 1911


William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)


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