vertical projector
Date1890-1910
Inventory Number1997-1-1712
ClassificationProjector
Subject
Maker
Jules Duboscq & Philibért François Pellin
1885 - 1912
Cultural Region
Place of Origin
Dimensions81 × 33 × 33 cm (31 7/8 × 13 × 13 in.)
Material
DescriptionThis instrument consists of a projecting prism and condensing lens at the top, both on a vertically moving arm designed for focusing purposes. That arm is attached to a drum containing an inclined mirror (inside) and a horizontal surface (top) on which light was shone. The drum rests on a telescoping stand, supported by three leveling screws.
Signedon drum, script: Mon. Jules Duboscq / Ph. Pellin / Paris
FunctionThis type of instrument was used for the projection of experiments done on a horizontal surface, whether light was polarized or not. For a description in one of Pellin's catalogue, go to the following website. This description mentions a series of accessories that could be used with it.
This particular one, however, was used for showing the propagation of waves in mercury. See an example of this instrument in the Pellin catalogue, here. In that case, it was used with an electromagnetic tuning fork that created the vibrations.
This particular one, however, was used for showing the propagation of waves in mercury. See an example of this instrument in the Pellin catalogue, here. In that case, it was used with an electromagnetic tuning fork that created the vibrations.
Jules Duboscq & Philibért François Pellin
Date: 1885-1900
Object number: 1997-1-1481
Jules Duboscq & Philibért François Pellin
Date: 1890-1910
Object number: BH0143
Jules Duboscq & Philibért François Pellin
Date: 1885-1912
Accessories: case
Object number: 1998-1-0509
Louis Jules Duboscq
Date: 1860-1880
Accessories: wooden base; wooden box
Object number: 2010
Louis Jules Duboscq
Date: 1850-1880
Accessories: cardboard cover for prism (2)
Object number: 1997-1-1680
Louis Jules Duboscq
Date: 1850-1880
Object number: 1997-1-1569
Louis Jules Duboscq
Date: 1850-1880
Accessories: RAPPORT FAIT A L'ACADEMIE ROYAL SCIENCES SUR UN NOUVEL HELIOSTAT, Presente par M. SILBERMAN aine. (in instrument file folder)
Object number: 2000