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Updated: June 28, 2025
You may urge, and justly urge, that a hundred years ago another theory was held by the most eminent men, and that, as the theory then held had to yield, the undulatory theory may have to yield also. This seems reasonable; but let us understand the precise value of the argument.
Those who accept the undulatory theory of light are necessitated to believe that all space is pervaded by an exceedingly tenuous fluid which is called ether, and that it is in this medium that the waves of light from self- luminous bodies are produced. Nobody has demonstrated the existence of this ether.
By slow degrees he compassed the bird about with his elastic mouth; his head flattened, his neck writhed and swelled, and two or three undulatory movements of his glistening body finished the work. Then he cautiously raised himself up, his tongue flaming from his mouth the while, curved over the nest, and with wavy subtle motions, explored the interior.
With his elegant plumage, his rhythmical, undulatory flight, his beautiful song, and his more beautiful soul, he ought to be one of the best beloved, if not one of the most famous; but he has never yet had half his deserts. He is like the chickadee, and yet different. He is not so extremely confiding, nor should I call him merry.
This was cutting deep with a vengeance, though the author of the theory seemed alone unable to see it. It went to the root of the whole mutter; and if Dr. Hampden was right, there was neither Church nor doctrine worth contending for, except as men contend about the Newtonian or the undulatory theory of light.
Keeping his wand pointed directly at my companion, the uncouth figure slowly and with a quite undescribable undulatory dancing motion, advanced toward our tree, the crowd hastily making way for him, and four members of the inner circle rising to their feet and following him at a touch from his finger.
It flew off much after the manner of the Summer Shrike, with flight not truly undulatory nor yet straight, but flapping half a dozen times then a pause and repeat.
Within this bower she motioned Hector to crouch down, leaving a small space for the free use of his bow; while concealed at the prow she gently and noiselessly paddled the canoe from the shore among the rice-beds, letting it remain stationary or merely rocking to and fro with the undulatory motion of the waters.
The motion of the surface of the sea falls within that formula, and hence is a special variety of wave motion, and the term wave has acquired in popular use this signification and nothing else. So that when one speaks ordinarily of a wave or undulatory motion, one immediately thinks of something heaving up and down, or even perhaps of something breaking on the shore.
If this undulatory current is passed through the coil of a similar telephone at the far end of the line, it will, by a reverse action, set the diaphragm in vibration and reproduce the original sonorous waves. The result is, that when another person listens at the mouthpiece of the receiving telephone, he will hear a faithful imitation of the original speech.
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