two-microscope linear micrometer
Datecirca 1910
Inventory Number1996-1-0619
ClassificationMicrometer
Subject
Maker
Carl Zeiss Jena
1904 - 1948
Maker
Carl Zeiss (company timeline)
founded 1846
Cultural Region
Place of Origin
Dimensions29.5 × 37.5 × 17.5 cm (11 5/8 × 14 3/4 × 6 7/8 in.)
Material
Bibliography
DescriptionTwo small compound microscopes sit in parallel on a shared base that is attached to a pedestal on a three feet. The microscopes are made of brass painted with black enamel. Their optical tubes are nickel-plated. The shared pedestal is shiny brass and the three feet have a black crackle finish.
The microscopes are not identical. The one on the proper left of the instrument has a coarse adjustment by rack and pinion of the optical tube. Fine adjustment is by a micrometer drum on the eyepiece. The microscope on the proper right has a fixed coarse focus. Fine focus is by another screw-micrometer eyepiece.
Neither microscope has a visible objective at the bottom. The microscope on the proper left has a scale on its tube from 0.4 - 1.4 with a sliding mechanism. The lower end of the optical tube of the microscope on the proper right has a large hollow space painted white to bounce in light.
The two microscopes share a long, rectangular stage operated longitudinally by pulling a nickel-plated knob and turning a brass screw. Different things are fixed on top of this stage below each microscope. The proper microscope has a rectangular stage with two stage clips and a slot to receive light from a substage concave / plane mirror. A fine adjustment screw is alongside the stage. The proper left microscope has a brass trough covered in glass. Inside the trough is a finely divided silver scale running from 0-100 mm. (A tag on the instrument says that the scale is also marked "8KNEK 1906.")
The microscopes are not identical. The one on the proper left of the instrument has a coarse adjustment by rack and pinion of the optical tube. Fine adjustment is by a micrometer drum on the eyepiece. The microscope on the proper right has a fixed coarse focus. Fine focus is by another screw-micrometer eyepiece.
Neither microscope has a visible objective at the bottom. The microscope on the proper left has a scale on its tube from 0.4 - 1.4 with a sliding mechanism. The lower end of the optical tube of the microscope on the proper right has a large hollow space painted white to bounce in light.
The two microscopes share a long, rectangular stage operated longitudinally by pulling a nickel-plated knob and turning a brass screw. Different things are fixed on top of this stage below each microscope. The proper microscope has a rectangular stage with two stage clips and a slot to receive light from a substage concave / plane mirror. A fine adjustment screw is alongside the stage. The proper left microscope has a brass trough covered in glass. Inside the trough is a finely divided silver scale running from 0-100 mm. (A tag on the instrument says that the scale is also marked "8KNEK 1906.")
Signedon stage: Carl Zeiss / Jena [in achromat trademark]
Inscribedon stage: Nr. 3196
FunctionThis two-microscope linear micrometer is for measuring linear distances between points on a specimen that would be too far apart to fit in the field of view of a single microscope. The user would locate a point on the specimen by looking through one microscope and read off its baseline position on the scale under the second microscope. Then the user would slide the stage to pick up another point on the specimen. The user would then take another scale reading from the second microscope. The difference in the readings would give the linear distance between the points on the specimen.
ProvenanceByerly Laboratory, Radcliffe College.
Historical AttributesThis instrument was used in the Byerly Laboratory at Radcliffe College.
Carl Zeiss, Optische Werkstätte, Jena
Date: circa 1886
Accessories: oculars (2): 1, 2; objectives (3): D, F, 1/12 HI; double nosepiece; Abbe condenser; iris diaphragm; cylinder-diaphragm on slide; articulated substage mirror; parts box [1084b]; Abbe drawing camera [1084c]; flat case; key.
Object number: 1084a
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
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
Camille Sébastien Nachet
Date: 1845-1850
Accessories: oculars (2): unmarked; objectives (7) : ?, 1(?), 2, 3, 4, 6, 7 in fitted wood box (1081b); mechanical stage (1081c); adjustable bull's eye; concave substage mirror; diaphragm wheel; specimen tray; black-white disk; case.
Object number: 1081a
E. H. & F. H. Tighe
Date: circa 1885
Accessories: ocular; empty box for 3 objectives; case
Object number: 1144
Spencer Lens Company
Date: circa 1916
Accessories: Spencer objectives with canisters (3): 1.8, 4, 16 mm; anonymous oculars (3): 10x, 1, 3; Abbe condenser; substage mirror; standing case; key; blue filter
Object number: 1997-1-1894
Carl Zeiss, Optische Werkstätte, Jena
Date: circa 1898
Accessories: oculars (4): 2, 4, and compensating oculars 6, 8; objectives: AA, DD, a2, and apochromat HI 2.0 mm; triple nosepiece; swing-out condenser with iris-cylinder diaphragm; disk diaphragm and central stop diaphragm; filter; eyepiece micrometer, brush, spare stage clips; large mechanical stage (2006-1-0114b); centering glass (2006-1-0114c) with instructions; magnification tables (2); standing case; key; leather traveling case (2006-1-0114d).
Object number: 2006-1-0114a
Charles-Louis Chevalier
Date: circa 1840
Accessories: 2 regular objectives; a high power objective; a low power objective (a variable power dissecting lens) with an extension arm for this lens; 2 dissecting lenses; 1 objective with lieberkuhn; objective with polarizer; 2 regular eyepieces; 1 erecting eyepiece; 1 micrometer eyepiece; stage micrometer, stage bull's eye condenser on jointed arm; camera lucida; tweezers; 3 dissecting tools; pillar extension;
compressorium, 2 objective adaptive mounts (one with Chevalier threads, another with Oberhauser threads); 2 adaptors for Chevalier lenses to other microscopes (one adaptor having Society threads); case.
Object number: 1093
Ernst Leitz (company)
Date: 1930-1935
Accessories: ocular 10; objectives (2): 3 (10x), 6L (45x); dual nosepiece; Abbe condenser with blue filter; case with key
Object number: 1342
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
Carl Zeiss Jena
Date: circa 1932
Accessories: apochromatic objectives (2): 20/ 0.65, 40/ 0.95; canisters (3): Apo 10/ 0.30, Apo 10/ 0.65, Apo 40/ 0.95; oculars (2): pair of K 7x Mobimi; stops (3); screwdriver with heavy locking screw with washer; wrench; standing case, key
Object number: 1389
Carl Zeiss, Optische Werkstätte, Jena
Date: circa 1902
Accessories: oculars (5); objectives (5); microplanar objectives (2); iris diaphragm; abbe condenser; collars and sleeves for photography; parts box; Leitz object micrometer (1308b); cardioid condenser (1308d); immersion oil bottle (1308c) ; Leitz erecting prism (1308e); standing case with key
Object number: 1308a