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Sin-um′bra-lamp.

A form of astral lamp in which the exterior edge of the circular oil-vessel is beveled off at the top so that the rays of light proceeding from the wick reach the surface on which the lamp is supported at a less distance from the center than in the ordinary construction. The light is also diffused by a ground-glass shade surrounding the chimney, so that the shadow is rendered imperceptible. (Sine umbra.)

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