electronic-feed carbon arc lamp
Date1950-1960
Inventory Number1997-1-0797
ClassificationLamp
Subject
Maker
Bausch & Lomb Optical Company
1853-present
Cultural Region
Place of Origin
Dimensions35.7 x 60 x 25.5 cm (14 1/16 x 23 5/8 x 10 1/16 in.)
Material
DescriptionLarge arc lamp in black crackle finish with condenser lens and carbon electrodes that are electronically controlled. In the path of the light that is generated is a pivoting mirror (missing here), which is used with a micro-projector microscope that was mounted on the top of the lamp. What was seen in the microscope was projected at the same time on a screen. This example has a black felt shade supported by a metallic structure fixed in the lamp. Perhaps the mirror was removed on purpose here so the light would not be reflected up, passing straight through instead.
The lamp runs on 12 amps current and uses 5.6 mm cored copper coated carbons. The power source is connected to a type 42-44-65 ballast resistance, similar to 1997-1-0768.
The lamp runs on 12 amps current and uses 5.6 mm cored copper coated carbons. The power source is connected to a type 42-44-65 ballast resistance, similar to 1997-1-0768.
Signedon plaque: BAUSCH & LOMB OPTICAL CO.
Curatorial RemarksThough not mention anywhere, it is highly probable that the ballast resistance with inventory number 1997-1-0768 was actually used with this arc lamp.
FunctionUsed in combination with a microscope, it produces an intense light that illuminates specimens in all types of microscopic studies.
In an ad from the May 3, 1957 Science magazine this lamp is thus described: "No flicker! No flare! Provides uniformly intense light for brilliant, vivid screen images--60 minutes without interruption! Efficient heat-control system eliminates need for cumbersome water cells and color-distorting coolants ... protects slides, ensures true color projection."
In an ad from the May 3, 1957 Science magazine this lamp is thus described: "No flicker! No flare! Provides uniformly intense light for brilliant, vivid screen images--60 minutes without interruption! Efficient heat-control system eliminates need for cumbersome water cells and color-distorting coolants ... protects slides, ensures true color projection."
Bausch & Lomb Optical Company
Date: 1950-1960
Object number: 2007-1-0065
Union Carbide and Carbon Corporation
Date: 1925-1960
Object number: 1997-1-0067a
Bausch & Lomb Optical Company
Date: circa 1948
Accessories: water chamber; 2 boxes of arc carbons (2002-1-0034c); rheostat (2002-1-0034b)
Object number: 2002-1-0034a
Ernst Leitz (company)
Date: 1940-1950
Accessories: boxes of arc carbons (3)
Object number: 1997-1-0669
Carl Zeiss (Oberkochen)
Date: 1956-1958
Object number: 2015-1-0003
Bausch & Lomb Optical Company
Date: 1950-1960
Object number: 1998-1-1637a
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
Théodore and Albert Duboscq
Date: 1880-1890
Accessories: small metal piece
Object number: 1998-1-1635
See also/See also
