Leitz AM petrographic compound microscope
Datecirca 1937
Inventory Number1999-1-0020a
ClassificationMicroscope
Subject
Maker
Ernst Leitz (company)
1849 - 1986
Maker
Chance Brothers & Company, Ltd
founded 1824
Maker
Arthur H. Thomas Company
1900-present
Maker
Jos. Schneider Optische Werke GmbH
founded 1913
Cultural Region
Place of Origin
Dimensionsmicroscope: 38 × 13 × 25.5 cm (14 15/16 × 5 1/8 × 10 1/16 in.)
case: 51 × 25.5 × 29.2 cm (20 1/16 × 10 1/16 × 11 1/2 in.)
box: 45.7 × 25.4 × 29.8 cm (18 × 10 × 11 3/4 in.)
case: 51 × 25.5 × 29.2 cm (20 1/16 × 10 1/16 × 11 1/2 in.)
box: 45.7 × 25.4 × 29.8 cm (18 × 10 × 11 3/4 in.)
Material
Accessoriesstandard eyepieces (3): 8X P, Periplan. OK 10X, and Periplan. Ok. 25X; wide eyepieces (3): 1, 1, 8X, 10X; objectives (4) in fitted case: 1b 4.3X, 3 10X, P7 62X, P 1/12 oel; waveplates (2); condenser with polarizer; mechanical stage; loupe 6x; box of cover glasses; standing case; key; objective adaptors (4); and watch keys (2)
Bibliography
DescriptionThis is a Leitz petrographic compound microscope, model AM. The Leitz catalogue of 1937 identifies this instrument as "of exceptionally large size" with a "wide tube for eyepieces of large diameter."
The modified horseshoe-shaped base is made of cast iron coated in a glossy black lacquer. The inclination joint has a clamping lever that is nickel or chrome plated. The handle arm above the inclination joint is curved and deep to permit manipulation of large specimens. The arm is also covered in black lacquer. The lower part of the arm carries a bracket to which is attached the stage and substage illuminating apparatus. The bracket is raised and lowered by rack and pinion by means of a bright brass knob with clamping lever attached to the lower arm. The upper part of the arm has the coarse and fine focus knobs in bright brass. The coarse adjustment is by rack and pinion. The fine focus is by a micrometer screw equipped with a divided drum.
The body tube is also brass and of wide diameter. There is no drawtube. The ocular fits into the top of the body tube. Below the ocular, there is a cap analyzer support with an index line. An Amici-Bertrand lens is in a centering mount with iris diaphragm, is attached to a slider, and is focusable by rack and pinion. The focusing knob is on the front of the body tube. The tube analyzer is the anastigmatic type with a correction lens mounted permanently within the tube. It is provided with a revolving mount and divided scale with intervals of 5 degrees. Below this on the tube is a slit at a 45-degree angle for the insertion of compensators. The objectives are each held in an adaptor which keeps each permanently centered. The adaptors slide one at a time into the objective clutch changer at the end of the body tube.
The stage is circular and rotatable. There is a scale on the limb and a vernier. It has a removable center ring plate and a clamping screw. The stage clips are nickel-plated (one is missing). The stage is moved by rack and pinion, as already mentioned.
The substage illuminating apparatus includes a two-iris-diaphragm type of Leitz model "aa." It has a 5-lens condenser above a polarizer prism. There is a swing-out supplementary condenser above the primary, larger condenser. Both the condenser and polarizer can be disengaged by a slide fitting with a locking lever. One iris diaphragm is above the condenser; the other is below the polarizer.
These illuminating components are mounted together on a bracket that attaches to a slider with a clamping lever. This slider travels on a track that is part of another fixture. This fixture is joined to the bracket supporting the stage but moves independently on its own rack and pinion.
The substage mirror is plano-concave and clamped by means of a screw to the stage bracket.
A standing mahognay case has a lock and key, and is fitted with sliding drawers and boxes.
Accessories include an eyepiece adaptor for use with eyepieces of standard diameter; 2 standard eyepieces (8X P and Periplan. Ok. 25X); 3 wide eyepieces (1, 1, 8X, 10X).
A fitted box lined in burgundy velvet and silk has brackets to hold 9 objectives on their adaptors. There are currently 4 objectives on adaptors (1b 4.3X; 3 10X; P7 62X; P 1/12 oel, A=1.30, 100:1). Two watch-key wrenches for centering the objectives are included. There is also a 1/4 wave glimmer plate and a Gips rot. I plate; a disk aperture stop; and a 6x loupe by Schneider-Kreuznach.
A second fitted box lined in burgundy velvet and silk holds a mechanical stage with two verniers.
A third box with a sliding lid is empty.
A red cardboard box is marked in pencil "10X." It holds a new eyepiece wrapped in paper. It is a "Periplan OK. [1]0X."
A cylindrical case of turned wood holds square cover slips. The red paper label is printed as follows:
SOLD AND RECOMMENDED BY ARTHUR H. THOMAS CO., PHILADELPHIA, PA., SINCE 1902 /
A.H.T. CO. SPECIFICATION / MICRO COVER GLASSES / NON-CORROSIVE / GUARANTEED AGAINST CORROSION / IN ANY CLIMATE /
1/2 OZ. / No. 7020 / SQUARES / 22 mm / No. 2 /
CUT AND PACKED / IN U. S. A. FROM / CHANCE MICRO SHEET / MADE IN ENGLAND / CONTINUOUSLY SINCE 1840
The modified horseshoe-shaped base is made of cast iron coated in a glossy black lacquer. The inclination joint has a clamping lever that is nickel or chrome plated. The handle arm above the inclination joint is curved and deep to permit manipulation of large specimens. The arm is also covered in black lacquer. The lower part of the arm carries a bracket to which is attached the stage and substage illuminating apparatus. The bracket is raised and lowered by rack and pinion by means of a bright brass knob with clamping lever attached to the lower arm. The upper part of the arm has the coarse and fine focus knobs in bright brass. The coarse adjustment is by rack and pinion. The fine focus is by a micrometer screw equipped with a divided drum.
The body tube is also brass and of wide diameter. There is no drawtube. The ocular fits into the top of the body tube. Below the ocular, there is a cap analyzer support with an index line. An Amici-Bertrand lens is in a centering mount with iris diaphragm, is attached to a slider, and is focusable by rack and pinion. The focusing knob is on the front of the body tube. The tube analyzer is the anastigmatic type with a correction lens mounted permanently within the tube. It is provided with a revolving mount and divided scale with intervals of 5 degrees. Below this on the tube is a slit at a 45-degree angle for the insertion of compensators. The objectives are each held in an adaptor which keeps each permanently centered. The adaptors slide one at a time into the objective clutch changer at the end of the body tube.
The stage is circular and rotatable. There is a scale on the limb and a vernier. It has a removable center ring plate and a clamping screw. The stage clips are nickel-plated (one is missing). The stage is moved by rack and pinion, as already mentioned.
The substage illuminating apparatus includes a two-iris-diaphragm type of Leitz model "aa." It has a 5-lens condenser above a polarizer prism. There is a swing-out supplementary condenser above the primary, larger condenser. Both the condenser and polarizer can be disengaged by a slide fitting with a locking lever. One iris diaphragm is above the condenser; the other is below the polarizer.
These illuminating components are mounted together on a bracket that attaches to a slider with a clamping lever. This slider travels on a track that is part of another fixture. This fixture is joined to the bracket supporting the stage but moves independently on its own rack and pinion.
The substage mirror is plano-concave and clamped by means of a screw to the stage bracket.
A standing mahognay case has a lock and key, and is fitted with sliding drawers and boxes.
Accessories include an eyepiece adaptor for use with eyepieces of standard diameter; 2 standard eyepieces (8X P and Periplan. Ok. 25X); 3 wide eyepieces (1, 1, 8X, 10X).
A fitted box lined in burgundy velvet and silk has brackets to hold 9 objectives on their adaptors. There are currently 4 objectives on adaptors (1b 4.3X; 3 10X; P7 62X; P 1/12 oel, A=1.30, 100:1). Two watch-key wrenches for centering the objectives are included. There is also a 1/4 wave glimmer plate and a Gips rot. I plate; a disk aperture stop; and a 6x loupe by Schneider-Kreuznach.
A second fitted box lined in burgundy velvet and silk holds a mechanical stage with two verniers.
A third box with a sliding lid is empty.
A red cardboard box is marked in pencil "10X." It holds a new eyepiece wrapped in paper. It is a "Periplan OK. [1]0X."
A cylindrical case of turned wood holds square cover slips. The red paper label is printed as follows:
SOLD AND RECOMMENDED BY ARTHUR H. THOMAS CO., PHILADELPHIA, PA., SINCE 1902 /
A.H.T. CO. SPECIFICATION / MICRO COVER GLASSES / NON-CORROSIVE / GUARANTEED AGAINST CORROSION / IN ANY CLIMATE /
1/2 OZ. / No. 7020 / SQUARES / 22 mm / No. 2 /
CUT AND PACKED / IN U. S. A. FROM / CHANCE MICRO SHEET / MADE IN ENGLAND / CONTINUOUSLY SINCE 1840
Signedon tube and mechanical stage: Ernst Leitz / Wetzlar
on oculars: Ernst Leitz Wetzlar
on objectives, 3 and P7: E. LEITZ / WETZLAR [in achromat trademark]
on objectives, P 1/12 oel and 1b 4.3X: Ernst Leitz Wetzlar
on top of arm: E. LEITZ / WETZLAR [in achromat trademark]
on magnification table inside case door: E. LEITZ, Optical Works, WETZLAR / Agencies: London, New-York, Tokyo, Peking
on loupe: Schneider-Kreuznach
on objectives, P 1/12 oel and 1b 4.3X, and on mechancial stage: Germany
on label of cover slips: CUT AND PACKED / IN U. S. A. FROM / CHANCE MICRO SHEET / MADE IN ENGLAND
on label of cover slips: ARTHUR H. THOMAS CO., PHILADELPHIA, PA.
Inscribedon tube: No. 286764
on magnification table: Leitz Microscope No. 286764
FunctionThis instrument permits work in crystallography, mineralogy, petrology, and general microscopy in transmitted, incident, and polarized light.
ProvenanceDr. Benjamin Shaub, Smith College, Northampton, Massachusetts; donated to CHSI by his wife, Mary S. Shaub, April 13, 1999.
Historical AttributesThis instrument was owned by Dr. Benjamin Shaub, Smith College, Northampton, MA.
Ernst Leitz (company)
Date: circa 1919
Accessories: oculars (2): 3, 8x; accessory box; Leitz objectives (5); wrenches (2); ground glass; N.A. 1.45 condensor cap; Abbe condensor; rotary stage; case
Object number: 1345
Ernst Leitz (company)
Date: circa 1953
Accessories: objectives (4); eyepieces (8); oil bottle; dropper bottle; cover slips; case.
Object number: 2009-1-0011b
Ernst Leitz (company)
Date: circa 1953
Accessories: objectives (4); eyepieces (8); oil bottle; dropper bottle; cover slips; case.
Object number: 2009-1-0011a
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
R. & J. Beck
Date: circa 1878
Accessories: oculars (3); eye mask; Beck objectives with cans (2): 1, 1/6 in.; anonymous onjective: 1/15 in homog. im..; tweezers; triple nosepiece; Rousselet-type sliding stage; Abbe condenser; iris diaphgragm; cover slips (2); prescription envelope; instructions; lock parts; standing case with key.
Object number: 1362
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
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 1928
Accessories: oculars (3)): 10x Mobimi, 15x & Mobimi, 10x; objectives (3) 90 / 1.25, 40 / 0.65, 10 / 0.30; canisters (3): 90, 40, 8; mechanical stage on vulcanite; Abbe illuminator; triple nosepiece; stops (2): 1, r; screwdriver with locking screw and washer; wrench; standing case; key.
Object number: 1996-1-0339
Ernst Leitz (company)
Date: circa 1903
Accessories: no.3 ocular; Leitz objectives (3) on triple nosepiece: no. 3, 6, 1/12 immersion; Abbe condenser; iris diaphragm and filter mount; independent mechanical stage
Object number: 1375
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
Ernst Leitz (company)
Date: 1888
Accessories: objectives (5): Leitz immersion 1/12 and 1/20, objectives 3, 5, 7 in leather covered wooden fitted box [1067b]; oculars (3): 0, 1, 3; dark field and disk diaphragms (2); cup diaphragms (3) with slide holder; Abbe condenser; extra substage mirror; iris diaphram and mirror on one bracket; microscope case with key; Leitz Bi-centric darkfield condenser Model B in brown leather shaped box [1167d]; set of test slides in a wooden box [1167c]
Object number: 1067a
Carl Zeiss Jena
Date: 1932-1940
Accessories: oculars (2): Leitz 6x; objectives (3): HI 90 / 1.25, 40 / 0.65, AA 10 / 0.30; condenser with iris; triple nosepiece; attached mechanical vulcanite stage
Object number: 1996-1-0345
