spectrometer collimator with scale
Date1850-1860
Inventory Number2007-1-0466
ClassificationSpectrometer Part
Subject
Maker
Louis Jules Duboscq
French, 1817 - 1886
User
Harvard College
founded 1636
Cultural Region
Place of Origin
Dimensions12.9 × 6.9 × 20 cm (5 1/16 × 2 11/16 × 7 7/8 in.)
Material
DescriptionA brass telescope tube has a focuser that has a cap holding a slotted disk of metal, which is a scale. The other end of the telescope tube has an aperture stop and lens. There is a flared ring around that end of the optical tube. The tube is held ina ring mount screwed to a bracket. The rotates by rackwork on an arc. This arc is the upper half of a fat clamp that would go on the spectrometer table. It has an index mark to position it against the spectrometer's divided circle along the rim of this table.
Very finely made. Knurling and details strongly suggest that this is by Duboscq.
Very finely made. Knurling and details strongly suggest that this is by Duboscq.
Signedunsigned
Inscribedin orange paint on bracket and eye cap: H
old paper tag, in pencil: Does not belong / to any particular / instrument.
FunctionThis optical tube is used in a spectrometer to project a scale to appear alongside the spectrum viewed with the spectrometer's telescope.
ProvenanceHarvard College Optics Lab.
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
Ball Brothers Research Corporation
Date: 1970-1973
Accessories: in file folder: 3 manuals for Skylab and 1 Preprint Series No. 638
Object number: 2001-1-0018
Bausch & Lomb Optical Company
Date: circa 1920
Object number: 1996-1-0657
![Tube current monitor from Lyman spectrometer [?]](/internal/media/dispatcher/42508/postagestamp)
Theodore Lyman IV
Date: 1921
Object number: RS0635a
Louis Jules Duboscq
Date: 1860-1879, 1882-1885
Object number: 1997-1-0687