Man's physical universe

xanabras

428 ENERGY MAY BE PROPAGATED BY VIBRATIONS

Polaroid glasses eliminate the glare from water, sand, sundecks,

snow, and ice.

Polaroid Lamps Provide Glareless Illumination.

By passing light through a polarizing screen whose polarizing axis

is vertical and at the proper angle relative to the table top, a glareless

reading lamp has been made possible.

Fig. 195. Left, photograph made with ordinary desk lamp. Right, photograph

made with a polarizing desk lamp. (Courtesy of The Polaroid Corporation.)

Beautiful Color Effects Are Produced by Interference of Polarized Light.

If a sheet of cellophane, mica, or cellulose tape is placed between two

polarizers so oriented that the light is eliminated, beautiful color effects

will be produced.

The production of color by this method offers excel-

FiG. 196. Strains revealed by polarized light. (Courtesy of the American

Optical Company.)

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