B&L carbon-arc projection microscope
Date1950-1960
Inventory Number1998-1-1637
ClassificationMicroscope
Subject
Maker
Bausch & Lomb Optical Company
1853-present
User
Biological Laboratories, Harvard University
founded 1932
Cultural Region
Place of Origin
Dimensions39.5 × 24.5 × 24.5 cm (15 9/16 × 9 5/8 × 9 5/8 in.)
Material
Accessoriesarc 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.
DescriptionThis is a Bausch & Lomb projection microscope intended to be used with a carbon arc lamp.
The microscope arm is attached to a black metal box serving as the base and seat of the microscope stage. There is a monocular eyepiece whose top is equiped with a prism that swivels. The prism projects an image on a screen. The body tube is aluminum and fits into a large cast metal housing, which carries a slotted wheel diaphragm with a spring-clip lock above the revolving nosepiece. A vertical column descends from a corner of the metal housing into a hole in the base. This arm is part of the linkage between the gearing of the nosepiece and the gearing for the set of condensers below the stage.
The quadruple nosepiece holds 3 objectives (10X, 21X, and 43X). The fourth opening is marked for a 2X power objective. It holds a vertical illuminator fitted with a hinged mirror, iris diaphragm marked in f-stops from f/4.5 to f/22, and a 48mm macro lens.
Coarse focus is by rack and pinion. Fine focus by a micrometer drum with each division equal to .002 mm.
The mechanical stage is built-in to the top of the base. There are 4 condensers mounted on a wheel below the stage. Rotating the quadruple nosepiece causes this wheel to rotate so that a given condenser is always matched to particular objective. A removable square panel on top of the base gives the user access to the condensers.
An circular glass window on the right side of the base is for the input of light from a carbon arc lamp (not present).
The microscope arm is attached to a black metal box serving as the base and seat of the microscope stage. There is a monocular eyepiece whose top is equiped with a prism that swivels. The prism projects an image on a screen. The body tube is aluminum and fits into a large cast metal housing, which carries a slotted wheel diaphragm with a spring-clip lock above the revolving nosepiece. A vertical column descends from a corner of the metal housing into a hole in the base. This arm is part of the linkage between the gearing of the nosepiece and the gearing for the set of condensers below the stage.
The quadruple nosepiece holds 3 objectives (10X, 21X, and 43X). The fourth opening is marked for a 2X power objective. It holds a vertical illuminator fitted with a hinged mirror, iris diaphragm marked in f-stops from f/4.5 to f/22, and a 48mm macro lens.
Coarse focus is by rack and pinion. Fine focus by a micrometer drum with each division equal to .002 mm.
The mechanical stage is built-in to the top of the base. There are 4 condensers mounted on a wheel below the stage. Rotating the quadruple nosepiece causes this wheel to rotate so that a given condenser is always matched to particular objective. A removable square panel on top of the base gives the user access to the condensers.
An circular glass window on the right side of the base is for the input of light from a carbon arc lamp (not present).
Signedon projection eyepiece, on top of microscope body, and on metal label on side of the base: B & L [in triangular trademark]
on projection eyepiece: BAUSCH / & LOMB / OPT. CO. / U.S.A.
on vertical illuminator: BAUSCH & LOMB OPT. CO. ROCHESTER, N.Y. U.S.A.
on objectives 10x and 21x: BAUSCH & LOMB / ROCHESTER, N.Y. U.S.A.
on objective 43x: BAUSCH & LOMB OPT. CO. / ROCHESTER, N.Y. U.S.A.
on metal label on side of the base: BAUSCH & LOMB / INCORPORATED / ROCHESTER, N.Y., U.S.A.
Historical AttributesThis microscope was used in the biology labs and Science Center for a Biology 15 course. According to tag this Serial No. FE1863, Model 42 63 48.
Bausch & Lomb Optical Company
Date: 1950-1960
Object number: 1998-1-1637a
Charles-Louis Chevalier
Date: 1835-1840
Accessories: 4 objectives; 4 oculars; inverting ocular; camera lucida; compressorium; galvanic stage; 1/100 mm stage micrometer; liquid trough; 2 bull's eyes; condenser with diaphragm wheel; mechanical stage; trough; eye shield; case with drawer and lid; spare wooden display base.
Object number: 1115
Nachet et Fils (I)
Date: 1862
Accessories: 6 objectives in box (1157b) with 1 substage condenser; oblique prism condenser; 3 oculars; 1 cup diaphragm, 1 diffuser, ; camera lucida; stage and eyepiece micrometers; liquid trough; 3 dissecting knives; prepared slides in box (1157d); plain slides; cover glasses; bull's eye on jointed arm(1157e); Amici's illuminator prism with stand (1157f); compressorium (1157g); case with parts box (1157c).
Object number: 1157a
Nachet et Fils (I)
Date: 1862-1880
Accessories: 5 objectives (11.5 mm) in leather-covered box (1025b): 1, 3, 5, 5, 7 immersion; 4 oculars: 1, 2, 3, no #; bull's eye on articulated stand (1025d); mahogany parts box (1025c with dissecting instruments: 6 needles, 2 scalpels, scissors, tweezers, 4 slides, box of cover glasses, 2 cup diaphragms, 1 diffuser ; flat case with fine lock, no key.
Object number: 1025a
Ernst Abbe
Date: circa 1886
Accessories: oculars (5): 0, 1,2, 3, 4; objectives (7): AA, A, C, D, E, F, 1/12 Homog. Immers. Apert. 1.20; Abbe condenser; disc diaphragms (6); cup diaphragms (3) with frame; articulated substage mirror; cyllindrical wooden box; key; case. See also Leitz camera lucida in small box (1123b) and stage screw micrometer (1123c).
Object number: 1123a
Carl Zeiss Jena
Date: circa 1928
Accessories: oculars(2): a pair of K 15x Mobimi; objectives (3): apochromats 20 n.a. 0.65 and 70 n.a. 1.25, and achromat 8 n.a. 0.20; mechanical stage; condenser with iris diaphgragm; locking screw with washer and screwdriver; standing case, key.
Object number: 1369
Camille Sébastien Nachet
Date: 1856-1862
Accessories: oculars (2): 2 , 3; objectives (6) in fitted box (1029b): 0, 1, 2, 3, 5, 7, along with substage condenser and oblique Nachet prism condenser; cup diaphram; flat case with parts box (1029c) holding diffuser, camera lucida; stage micrometer; ocular micrometer; wet specimen trough, 4 slides in red leather box (1029d); bull's eye condenser.
Object number: 1029a
Carl Zeiss Jena
Date: 1930-1932
Accessories: binocular tube; eyepieces (2); objectives (4); objective canisters (3); case; key; wrench; screwdriver and locking screw
Object number: 1371
Ernst Leitz (company)
Date: circa 1970
Accessories: Leitz objectives (3 Phaco achromats): 100x, D44667; 40x, D4527; 10x, D43270; Zeiss objective A, 17776; phase condenser, D36977; Leitz oculars (pair): Periplan 10X; Leitz phase eyepiece ("Lichteinstellupe"); anonymous 10x micrometer eyepiece
Object number: 2003-1-0004
E. Hartnack & A. Prazmowski
Date: circa 1870
Accessories: objectives (7): 1, 2, 4, 5, 7, 9,10 in fitted box ; eyepieces (4): 1, 4, 5, 6; cup diaphragms (4); polarizer set; bull's eye condenser on stand; Oberhaeuser-style camera lucida; tweezers; substage rotating wheel diaphragm attached to holder with blue glass filter; substage glass filter holder with blue glass filter; substage condenser; dual nosepiece, Hartnack 1/100 mm stage micrometer; flat case; key; magnification table; price lists (2).
Object number: 1080
Carl Zeiss Jena
Date: circa 1932
Accessories: objectives (4): 3 achr. 8x, 10x, 20x , APO 40; ocular Mobimi K7x; condensor; mechanical stage; stereo set of ocular caps and stop; Abbe condensor; standing case.
Object number: 1370
VEB Carl Zeiss Jena
Date: circa 1960
Accessories: objectives (2): Ph 40 0.65 0.17, B & L 4mm 0.65; ocular: K20x; phase condenser nosepiece
Object number: 1996-1-0340