mechanical feed microscope arc lamp
Datecirca 1948
Inventory Number2002-1-0034a
ClassificationMicroscope Light Source
Subject
Maker
Bausch & Lomb Optical Company
1853-present
Owner
Arthur D. Little, Inc.
founded 1909
Cultural Region
Place of Origin
Dimensions24.5 × 16.5 × 35.5 cm (9 5/8 × 6 1/2 × 14 in.)
Material
Accessorieswater chamber; 2 boxes of arc carbons (2002-1-0034c); rheostat (2002-1-0034b)
Bibliography
DescriptionThis is a Bausch & Lomb mechanical feed arc lamp, model 31-33-81.
The mechanical feed arc lamp runs on clockwork. The condenser is focused by rack and pinion. There is an adjustable iris diaphragm and a holder for the removable, heat-absorbing, Pyrex, water chamber. V-shaped pockets are provided to hold neutral density filters (missing).
The apparatus is operable with DC or AC, using a rheostat (i.e. ballast resistor) [item 2002-1-0034b] and differently-cored carbons [2002-1-0034c].
The stand is missing.
The mechanical feed arc lamp runs on clockwork. The condenser is focused by rack and pinion. There is an adjustable iris diaphragm and a holder for the removable, heat-absorbing, Pyrex, water chamber. V-shaped pockets are provided to hold neutral density filters (missing).
The apparatus is operable with DC or AC, using a rheostat (i.e. ballast resistor) [item 2002-1-0034b] and differently-cored carbons [2002-1-0034c].
The stand is missing.
Signedon plaque: BAUSCH & LOMB OPTICAL CO. / ROCHESTER, N.Y., U.S.A.
on plaque: B&L [in prism logo]
Inscribedon plaque: Type 42-44-81 / 31-33-81
on label on clockdrive: Arthur D. Little, Inc. / 213-032
FunctionThe mechanical feed arc lamp was used as an all-purpose, high intensity light source. This example was used in Industrial laboratory work.
ProvenanceArthur D. Little, Inc.
Historical AttributesThis instrument was used in the microscope laboratory of Arthur D. Little, Inc., perhaps for darkfield work or ultramicroscopy. It was discarded in late 1980s and salvaged by Peter von Thüna.
Ernst Leitz (company)
Date: 1940-1950
Accessories: boxes of arc carbons (3)
Object number: 1997-1-0669
Bausch & Lomb Optical Company
Date: 1950-1960
Accessories: arc lamp, power supply, and carbons original to this microscope have been separated from it (1998-1-1637a). Objectives (3): 10X, 21X, 43X; vertical illuminator; projection eyepiece.
Object number: 1998-1-1637
Bausch & Lomb Optical Company
Date: circa 1948
Object number: 2002-1-0034b
Bausch & Lomb Optical Company
Date: 1950-1960
Object number: 1997-1-0797
Ernst Leitz (company)
Date: circa 1930
Accessories: Leitz objectives (2): 3, 7; "projection" ocular; integral arc lamp assembly; glass water chamber; frame with tripod base
Object number: 1347
Bausch & Lomb Optical Company
Date: 1950-1960
Object number: 2007-1-0065
Carl Zeiss (Oberkochen)
Date: 1956-1958
Object number: 2015-1-0003
Union Carbide and Carbon Corporation
Date: 1925-1960
Object number: 1997-1-0067a
Crosby Steam Gage & Valve Company
Date: circa 1903
Accessories: instruction manual; letter from company; one gallon can of oil (2002-1-0100)
Object number: 1998-1-1618
Crosby Steam Gage & Valve Company
Date: circa 1900
Accessories: calibrated piston, adaptors for mounting gauges to testing apparatus (9); valve from another company [inscribed "BUCKEYE [?] WORKS/DAYTON O.]; screwdriver handle (or hex wrench); wrenches (2); receptacle oil can (missing top); weights missing; one gallon can of oil (2002-1-0100)
Object number: 2002-1-0003
See also/See also
