Education and demonstration – Science – Physics
Patent
1997-10-08
1999-11-02
Hafer, Robert A.
Education and demonstration
Science
Physics
434402, 434426, G09B 2306, G09B 2500
Patent
active
059759119
ABSTRACT:
A device which directly displays a steady state sinusoidal wave by positioning a scrolling pattern of alternating stripes (40 and 42) behind a flexible linear body comprising a vibrating rod (36) or string (50). The stripes (40 and 42) cover the outer surface of a moving body, which can be a rotating cylinder (20), spinning disk (74), or traveling belt (94) and are drawn perpendicular to the vibrating rod (36) or string (50). One set of stripes (40) is of a tonality that visually blends with the tonality of the vibrating element, and the alternate set of stripes (42) is of a tonality which contrasts with that of the vibrating element. Each respective stripe, therefore, either obscures or accentuates the segment of the vibrating element which is between it and the viewer. The viewer sees a solid wavy line in the form of a sinusoidal wave by observing the vibrating element with the stripes scrolling behind it. This device also displays the section of the shadow of the vibrating element which falls on the surface of the scrolling pattern as a solid wavy line in the form of a sinusoidal wave.
REFERENCES:
patent: 2446047 (1948-07-01), Kent
patent: 2593501 (1952-04-01), Thomas
patent: 4345247 (1982-08-01), Thornton
Seeing Sound by Sinston E. Koch, Wiley-Interscience Div. of John Wiley and Sons, New York, 1971, pp. VII-VIII, 8-18, 35-38, 78-89.
Nasco Science '97, science catalog #387, by Nasco Science Equip. Co., Modesto, Ca., 1997, pp. 314-315.
T. F. Harris, Handbook of Acoustics, pp. 37-39 J.Curwen and Sons, London, c. 1890's.
Hafer Robert A.
Rovnak John Edmund
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