B&L GGBE laboratory binocular compound microscope
Date: 1930-1935
Inventory Number: 2003-1-0007
Classification: Microscope
Subject:
Maker: Bausch & Lomb Optical Company (1853-present)
Maker: Spencer Lens Company (1895 - 1945)
Maker: Ernst Leitz (company) (1849 - 1986)
User: Farlow Herbarium (founded 1919)
Cultural Region:
Place of Origin:
Dimensions:
30 x 16.5 x 19 cm (11 13/16 x 6 1/2 x 7 1/2 in.)
case: 30 x 16.5 x 19 cm (11 13/16 x 6 1/2 x 7 1/2 in.)
Accessories: micrometer eyepiece; oculars (5): 1 Leitz 8x, 1 pair B&L 6.4x, 1 pair B&L 12.5x; objective: Spencer 48 mm., 2.2x; monocular tube; glass bottle for immersion fluid; B & L canisters (3); case with key
DescriptionThis is a Bausch & Lomb binocular laboratory GGBE compound microscope. The base is iron, V-shaped and blackened. The arm is C-shaped. The instrument is equipped with a binocular body. The coarse adjustment is by rack and pinion. The fine focus is the patented Bausch & Lomb lever-type. The fine focus knob is graduated. There is a double revolving nosepiece.
The stage is a square mechanical one with verniers. The substage condenser has an iris diaphragm and a slot for filters. The plano-concave mirror is on a fixed support are located to the frame that carries the illuminating apparatus up and down by rack and pinion.
Accessories include an optional monocular tube and a case with key. A glass flask holds immersion oil.
Oculars include a pair of 12.5 and a pair of 6.4 by B&L; a Leitz 8x; and an unsigned 3x micrometer eyepiece.
Objectives originally included a 4 mm, 16 mm, and a 1.8 mm fluorite. Only the canisters remain. The microscope currently has a Spencer Lens Co. objective of 48 mm 2.2X on the nosepiece.
The stage is a square mechanical one with verniers. The substage condenser has an iris diaphragm and a slot for filters. The plano-concave mirror is on a fixed support are located to the frame that carries the illuminating apparatus up and down by rack and pinion.
Accessories include an optional monocular tube and a case with key. A glass flask holds immersion oil.
Oculars include a pair of 12.5 and a pair of 6.4 by B&L; a Leitz 8x; and an unsigned 3x micrometer eyepiece.
Objectives originally included a 4 mm, 16 mm, and a 1.8 mm fluorite. Only the canisters remain. The microscope currently has a Spencer Lens Co. objective of 48 mm 2.2X on the nosepiece.
Signedon monocular tube: BAUSCH & LOMB OPTICAL CO. / Rochester N.Y. U.S.A.
on the binocular tube: BAUSCH & LOMB OPTICAL CO. / ROCHESTER N.Y.
on binocular tube: U.S.A. [in a prism]
on canisters: B. & L. O. CO.
on objective: SPENCER / BUFFALO / U.S.A. [in achromat trademark]
on ocular, 8x: Ernst Leitz Wetzlar
on the binocular tube: BAUSCH & LOMB OPTICAL CO. / ROCHESTER N.Y.
on binocular tube: U.S.A. [in a prism]
on canisters: B. & L. O. CO.
on objective: SPENCER / BUFFALO / U.S.A. [in achromat trademark]
on ocular, 8x: Ernst Leitz Wetzlar
Inscribedin grease pencil on base: Murphy / Carol !
serial number on arm: 231074
on arm: ONE INT. / 0.0025
serial number on arm: 231074
on arm: ONE INT. / 0.0025
Historical AttributesThis instrument was used in the Farlow Herbarium, Harvard University, Cambridge, MA.
Curatorial RemarksThe file contains a clear folder with a handwritten table probably giving the scale of the micrometer eyepiece with an unknown immersion lens.
Primary SourcesBausch & Lomb, Scientific Instruments, catalogue D-111 (Rochester, 1940), 24-29.
ProvenanceFarlow Herbarium, Harvard University, Cambridge, MA