wave machine demonstrating interference
Date1920-1950
Inventory Number1996-1-0330
ClassificationWave Model
Subject
Cultural Region
Place of Origin
Dimensions29 x 76.5 x 15.5 cm (11 7/16 x 30 1/8 x 6 1/8 in.)
Material
DescriptionThe instrument is framed in wood and supported by two rectangular feet. The above wave pattern is made of several narrow wooden strips that can move up. Below is a solid wooden wave pattern that is inserted from the right. Its handle is made of a thin piece of brass. Two more, with different patterns, are stored behind the instrument on wooden brackets.
Once a wave pattern has been inserted, the handle at the back is lifted up. The solid wave pattern, when moved up by this lifting motion, pushes up the narrow strips of wood composing the above pattern. The new pattern resulting from this push is the interference pattern of the two waves.
On top of the frame, behind, "four" and "4" have been handwritten. Similarly for one of the solid wave pattern. It was probably shop-built at Harvard University.
Once a wave pattern has been inserted, the handle at the back is lifted up. The solid wave pattern, when moved up by this lifting motion, pushes up the narrow strips of wood composing the above pattern. The new pattern resulting from this push is the interference pattern of the two waves.
On top of the frame, behind, "four" and "4" have been handwritten. Similarly for one of the solid wave pattern. It was probably shop-built at Harvard University.
In Collection(s)
Signedunsigned
Friedrich Fessel
Date: 1850-1864
Accessories: additional wave troughs (2)
Object number: 1996-1-0411
American
Date: 1870-1920
Accessories: box; wooden handle
Object number: 2007-1-0098
Royal Mint
Date: date 1992
Accessories: red fabric-covered case; certificate of authenticity
Object number: 1995-1-0008
George Erle Beggs
Date: early 20th-mid 20th Century
Accessories: 6 deformeter gauges;
22 plugs;
2 cylindrical plastic boxes containing screws and metal strips for fastening the ends of the structure;
metal stylus;
2 metal pins;
2 celluloid wedges;
1 rectangular celluloid piece with a wedge coming out of one end
Object number: 1999-1-0064
R. & J. Beck
Date: 1876
Accessories: oculars (2) in microscope; Darker's selenite retarding filters (3); wheel diaphragm; mechanical rotary stage; stage slider. Other accessories are in the case (1122b), including monocular draw tube; oculars (3); objectives in cans (5); empty can; Lieberkühn; polarizing set; slides; camera lucidas (2); etc.; plus a Beck patent substage condenser (1122c); and apertometer (1122d).
Object number: 1122a
E. S. Ritchie & Sons
Date: 1867-1886
Object number: 1996-1-0354
William Bond and Son
Date: circa 1867
Object number: 2005-1-0092