B&L no. 520 educational compound microscope
Datecirca 1877
Inventory Number1293
ClassificationMicroscope
Subject
Maker
Bausch & Lomb Optical Company
1853-present
Cultural Region
Place of Origin
Dimensionsmicroscope: 32 × 15.5 × 16.5 cm (12 5/8 × 6 1/8 × 6 1/2 in.)
case: 38 × 19.5 × 17.6 cm (14 15/16 × 7 11/16 × 6 15/16 in.)
case: 38 × 19.5 × 17.6 cm (14 15/16 × 7 11/16 × 6 15/16 in.)
Material
Accessoriesobjectives(2); green leather box; oculars (2); green leather box; box of cover slides; standing case
Bibliography
DescriptionThis is a Bausch & Lomb No. 520 educational compound microscope. It has a three-foot base made out of cast iron. The arm is also cast iron while the body tube and pillars are brass. There is a rack and pinion coarse focus adjustment; the fine focus is a screw located near the stage.
The stage is made out of hard rubber. A revolving wheel diaphragm and a concave mirror are located below the stage.
According to the early note card, this microscope is a slightly modified version of CHSI 1096. The basic design is the same but all parts are a fraction of an inch larger.
This microscope is accompanied by a standing wooden case. Additional accessories include a green leather box holding two objectives, two oculars (one which doesn't fit), and a box of cover slides.
The stage is made out of hard rubber. A revolving wheel diaphragm and a concave mirror are located below the stage.
According to the early note card, this microscope is a slightly modified version of CHSI 1096. The basic design is the same but all parts are a fraction of an inch larger.
This microscope is accompanied by a standing wooden case. Additional accessories include a green leather box holding two objectives, two oculars (one which doesn't fit), and a box of cover slides.
Signedon tube: BAUSCH & LOMB OPTICAL CO. / ROCHESTER, N.Y.
Inscribedon lens card and case: 975
ProvenanceDr. Elisha Boland, Boston, MA
Historical AttributesThis microscope was owned by Dr. Elisha Boland, a general practitioner in South Boston.
Bausch & Lomb Optical Company
Date: circa 1877
Accessories: B&L objectives (2); 1 ocular; camera lucida; eyepiece micrometer; slides (12 prepared; 2 plain); glass pipette; box of cover glasses; directions card; magnification card; case with key
Object number: 1056
Bausch & Lomb Optical Company
Date: circa 1889
Accessories: objectives (4); ocular; standing case; key
Object number: 1124
E. Hartnack & A. Prazmowski
Date: circa 1880
Accessories: objectives in green leather box (5): 2, 4, 6, 7, and unmarked; objectives in brown box (2): 2, 3; oculars (5); 1, 2, 3, 4, 5; polarizing eyepiece and substage apparatus; substage condenser; substage cup diaphragms (4); slider with sleeve to hold substage accessories; large bull's eye condenser with stand; aperture-stop rotating wheel; blue filters (3); flat case; case keys (2).
Object number: 1145a
Spencer Lens Company
Date: circa 1908
Accessories: oculars (2): 4x, 8x; Spencer objectives (3): 16, 4, 1.8 mm; blue filter; dark field stop; booklet; slides (4); box of cover slips; case; key.
Object number: 1323
Constant Vérick
Date: circa 1880
Accessories: objectives (2): 2, 6, in green leather covered box; oculars (2): 1, 3; dissecting needle; eyedropper; flat case
Object number: 1240
Bausch & Lomb Optical Company
Date: 1900-1908
Accessories: objectives (3): 2 mm, 4 mm, 16 mm; oculars (2): 5, 10; condenser with two diaphrams; standing case with lens card
Object number: 1298
Bausch & Lomb Optical Company
Date: circa 1918
Accessories: 1 ocular: 4x; B&L objectives (3): 16 , 4, 1.9 mm on triple nosepiece; B&L objective cans (2):1/6, 2/3; standing case
Object number: 1356
Bausch & Lomb Optical Company
Date: 1925-1930
Accessories: oculars (2); objectives (2); case
Object number: 1996-1-0127
Bausch & Lomb Optical Company
Date: 1930-1935
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
Object number: 2003-1-0007
Bausch & Lomb Optical Company
Date: circa 1899
Accessories: B&L objectives on triple nosepiece and with cans (3): 1/12, 1/6, 2/3"; Zeiss objective for oil immersion: 40; Leitz mechanical stage; oculars (2): 1, 2; Abbe condensor; immersion oil can; standing case; key; spare stage clips.
Object number: 1351
Ernst Leitz (company)
Date: circa 1948
Accessories: objectives (2): P3b A 0.40 16,5:1 C and P6L A 0.65 45:1; ocular "0"; polarizing condenser; analyzer; box with 14 older petrographic slides [1346b]; standing case
Object number: 1346a
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