Clipart tagged: ‘measure light’

"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

Rotator

"In photometry (measure of light), a mounting for an incandescent lamp ... Rotator. The lamp to be tested…

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