Abstract
IN the evidence given before the Committee on Electric Lighting, some mention was made of the difficulty of equalising the light over any considerable area; but it is worth while to remark that by a simple form of reflector it is possible to make the light very approximately uniform over an area whose radius is twice the height of the lamp above the ground. For imagine a sphere with the lamp as a centre and its height above the ground for radius. Supposing the lamp radiates equally in all directions, the surface of this sphere will be uniformly illuminated, and its surface has an area 4 π h2. If now we take a plane circular area about the foot of the lamp-post with radius R such that—
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MALLOCK, A. Electric Lighting. Nature 20, 314 (1879). https://doi.org/10.1038/020314b0
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DOI: https://doi.org/10.1038/020314b0
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