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MOTION
PICTURE
PHOTOGRAPHY
The existence of an all pervading ether is, however, somewhat more difficult to grasp. Much like our knowledge of the air, its existence is only an inference from observed facts. Ether is an all-pervading medium in which the entire universe is submerged, and by means of radiation or vibration, are transmitted light, radiant heat, actinic radiation, X-rays, electro-magnetic oscillations, magnetism, and Hertzian waves. Of these forms of radiant energy, light, or those radiations which enable the eye to see objects, are the only ones with which we are to deal.
Light is transmitted through the ether in straight lines, by very minute waves or vibrations, which travel with great rapidity.
For purposes of comparison, we often refer to the similarity of light waves to sound waves, but sound waves are carried by
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Fig. 1.
A B represents a minute section of a ray of light traveling in the direction indicated by the arrows. The curved line represents light waves. The distance from crest to crest of two consecutive waves is the wave length designated by C. The distance Rr from the crest to the bottom of the curve is called the amiplitude of vibration.
the atmosphere at a comparatively slow rate. It will be noted when viewing the steam emitted by a whistle at some distance from the observer that the steam is seen some little time before the sound is heard, showing that the light waves from the object travel much more quickly than the sound. Ether waves do not correspond to sound waves in some other respects. For instance, sound waves are composed of alternate compressions and refractions, while the wave movement or displacement in light waves is from side to side at right angles to the direction in which the light wave is traveling.
Figure one is an illustration of the movement of light waves from side to side as it might appear if it were possible to magnify a ray of light and render it visible. Light itself is not visible. When we say we see a ray of light, as we sometimes do when the
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