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 63
m thebare bulb is on the horizontal, the effect of frost-ing is to decrease the light in that direction. But,on the other hand, where previously there was lesslight—from the tip of the lamp below, and the 38 THE LIGHTING BOOK socket above—frosting increases quite appreci-ably the useful light in… … The Light Distribution from an Upright Gas Mantle CloselyResembles that of the Tungsten Lamp. The Inverted MantleBeside Throws Most of the Light Below owing to the greater light-radiating surface there.Thus, in the diagram above the characteristic dis-tribution of light about a bare Welsbach…
Lighting
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
