The lighting book; a manual for the layman, setting forth the practical and esthetic sides of good lighting for the home (1913)
Godinez, F. Laurent · New York, McBride, Nast & company · leaf 62
eir horizontal, orside candle power. Hence the electric lampwhich gives sixteen candle power on the hori-zontal, is rated as a sixteen candle power lamp,despite the fact that the candle power from the MODIFICATION OF LIGHT 37 tip downward (when the lamp is in a pendantposition) is but 6.6. The… … 3. The Modification in the Direction of LightMade by Frosting the Bulb. B, Clear Glass;A, Ground Glass lamp. The effect of frosting or roughening theouter surface of the glass bulb is indicated by A,the effect of this treatment being to give morelight in directions where there was less before.Thus,…
Lighting
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