constant deviation spectrometer
Datecirca 1920
Inventory Number1996-1-0657
ClassificationSpectrometer
Subject
Maker
Bausch & Lomb Optical Company
1853-present
Cultural Region
Place of Origin
Dimensions26.5 x 39 x 22 cm (10 7/16 x 15 3/8 x 8 11/16 in.)
Material
DescriptionThis instrument consists of a dust-proofing housing with removable cover plate containing a prism, the instrument's operating mechanism and a graduated wavelength drum. The prism is most likely of the Pellin Broca type, made of a single piece of flint glass. The prism, fixed on a table, rotates by a cam attached to a vertical shaft. The shaft goes through the bottom of the housing. A knurled knob is found at the lower end.
A window with an index would, on the original model, been placed in such a manner that the wavelength drum can be seen directly from the eyepiece position. This particular example is different, with a brass casing equipped with mirrors and a pivoting lens to see the drum. These suggest that the telescope was attached to another instrument, a spectrographic camera, for instance, and a different system had to be shop-built in order to better see the graduation on the wavelength drum.
The slit mounting on the other optical tube appears to have been removed. A wingnut is used so the instrument does not pivot. It is supported by a tripod.
A window with an index would, on the original model, been placed in such a manner that the wavelength drum can be seen directly from the eyepiece position. This particular example is different, with a brass casing equipped with mirrors and a pivoting lens to see the drum. These suggest that the telescope was attached to another instrument, a spectrographic camera, for instance, and a different system had to be shop-built in order to better see the graduation on the wavelength drum.
The slit mounting on the other optical tube appears to have been removed. A wingnut is used so the instrument does not pivot. It is supported by a tripod.
Signedon instrument: BAUSCH & LOMB OPTICAL CO.
FunctionA spectrometer is used in studying the properties of substances by means of light spectra.
For more examples on types of spectrometers and how they work, see the following website.
For more examples on types of spectrometers and how they work, see the following website.
Hilger and Watts, Ltd.
Date: circa 1963
Accessories: acrylic case; instruction manuals for spectrometer (a) and microscope (b) are in the library; extra silver knob in plastic bag
Object number: 1999-1-0021a
Hilger and Watts, Ltd.
Date: circa 1963
Accessories: acrylic case; instruction manuals for spectrometer (a) and microscope (b) are in the library; extra silver knob in plastic bag
Object number: 1999-1-0021c
Adam Hilger Ltd.
Date: 1924-1930
Accessories: Photographic plate holder
Object number: 2005-1-0012a,b
Central Scientific Company
Date: 1935-1950
Accessories: instruction manual
Object number: 1997-1-0358a
Bausch & Lomb Optical Company
Date: circa 1970
Accessories: platform
Object number: 1999-1-0089
Adam Hilger Ltd.
Date: circa 1930
Object number: 1996-1-0675
Edwin H. Land
Date: 1955-1980
Object number: 2004-1-0264a
Wild Heerbrugg Ltd.
Date: 1960
Object number: 1997-1-0722