| In 1868, Prof. Chester Smith Lyman,
Professor of Industrial Mechanics and Physics in the Yale Scientific School,
published a description of the wave machine at the left. The design had
been patented by Lyman on November 19, 1867, who assigned the patent to
the Boston maker of physical instruments, E. S. Ritchie.
Lymanís wave machine was designed to demonstrate the motion of water molecules during the passage of deep-water waves.
This is one of two Lyman wave machines at Yale University.
|Lyman reproduced the aspects of water wave motion in a simple mechanical device mounted on a board 17 in. high and 26 in. long. The ends of a series of nine cranks, revolving simultaneously and successively 45° out of phase with each other, represent water molecules. A thin, flexible wire passing through freely rotating studs at the ends of the cranks traces out the shape of the water surface. A set of shorter cranks placed on a lower level illustrate the decrease in the amplitude of the circular motion with increasing depth. The back view of the wave machine shows how a single plate connects all eighteen cranks and makes them rotate together.|
| From the sticker on the back of this wave machine: "This
apparatus demonstrates the formation and propagation of I, Water Waves,
II, Sound Waves and III, Ether Waves including Light, Heat and Electric
Waves. It also demonstrates the progressive waves of a vibrating cord.
By turning the crank counter clockwise the waves will move from left to right.
This apparatus in the invention of Dr. Charles Forbes, Curator in Physics, Columbia University, New York City. The application for Patent was filed May 10, 1905."
The captions are excepted from: Thomas B. Greenslade, Jr., "The Water-Wave Machines of C. S. Lyman and C. S. Forbes", Rittenhouse, 11, 81-85 (1997)
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