Crouch binocular compound microscope
Datecirca 1893
Inventory Number1148
ClassificationMicroscope
Subject
Maker
Henry Crouch
late 1800s
Maker
Robert B. Tolles
1823 - 1883
Supplier
James W. Queen & Company
1853 - 1893
Owner
Alexander Agassiz
1835 - 1910
Owner
Museum of Comparative Zoology
founded 1859
Collector
Ernst-Lewis Collection of Microscopes
Cultural Region
Place of Origin
Dimensions40 x 21 x 15 cm (15 3/4 x 8 1/4 x 5 7/8 in.)
Material
Accessoriesobjective: Tolles 1/4 ", dated 3/30/1869; paired oculars 31mm diameter (2); circular stage; condensor with diaphragm wheel; flat concave substage mirror
DescriptionThis is a Crouch binocular compound microscope. It has a curved arm and a standing tripod base with a curved u-shaped back. The binocular body is comprised of two converging body tubes. The coarse adjustment is by rack and pinion. The fine adjustment is by a screw and lever located near the nosepiece.
The microscope has a circular, rotating stage with a knurled edge. The stage also has a glass surface and a hole in the center. Sub stage equipment includes a condenser, a rotating disc diaphragm, and a mirror on a swinging tube.
The instrument is constructed of brass. The arm and base are blackened.
The microscope has a circular, rotating stage with a knurled edge. The stage also has a glass surface and a hole in the center. Sub stage equipment includes a condenser, a rotating disc diaphragm, and a mirror on a swinging tube.
The instrument is constructed of brass. The arm and base are blackened.
In Collection(s)
Signedon base: Henry Crouch, London / Agents
on base: James W. Queen & Co. Philadelphia
Inscribedon base: 1601
Curatorial RemarksThere is a note by Dr. Lewis about the maker, Henry Crouch, in the file.
ProvenanceAlexander Agassiz's Newport Laboratory; Harvard University Museum of Comparative Zoology; Ernst-Lewis Collection of Microscopes (inv. no. 148), Harvard Medical School.
Historical AttributesThe instrument was used in Alexander Agassiz's Newport Laboratory.
H & W Crouch
Date: 1862-1867
Accessories: objectives (3), unmarked, with canisters: 2, 3, 1/4 "; broken objective in canister signed W. Crouch; one pair of oculars; short ocular; dark field condensors (2); polarizer set; bull's eye; drawer with 44 preparation slides; veneered wooden base with two drawers
Object number: 1186
Spencer Lens Company
Date: 1930-1933
Accessories: objectives (3) 1.8 mm, 4 mm, 16 mm; paired oculars: 10x; monocular tube; mechanical stage; spare stage clips; blue filter; case; key.
Object number: 1996-1-0338
Spencer Lens Company
Date: circa 1933
Accessories: paired oculars 10x; Spencer objectives (2): 4mm,16mm; condenser with iris; mirror
Object number: 1996-1-0344
Spencer Lens Company
Date: circa 1933
Accessories: paired oculars 10x; Spencer objectives (2): 4mm, 16mm; AO objective 10x; condenser with iris; mirror
Object number: 1996-1-0343
Joseph Zentmayer
Date: circa 1875
Accessories: monocular body tube; 1 set of paired eyepieces; oculars (3); objective in canister: 8/10; wheel diaphragm; glass window; case; key.
Object number: 1073
Ross and Company
Date: circa 1876
Accessories: paired oculars A,B; paired Ross oculars; objectives (3): :1/2 (no can), 2 Beck , 1/5 Ross; Wenham parabolic illuminator; condensor; X-Y and rotary stage; bull's eye on stand; double nosepiece; standing case
Object number: 1300
Joseph Zentmayer
Date: circa 1880
Accessories: Zentmayer objective with cannister: 1 1/2; paired oculars (3); Bicknell's achromatic condenser; rotating wheel diaphragm; polarizing eyepiece, polarizer by objective; camera lucida; plane glass window and brass socket; monocular tube; parts box with key; standing case with key.
Object number: 1015
Powell & Lealand
Date: circa 1845
Accessories: paired oculars (2); objectives (3): 1/4, 1/2, 1 "; frog plate; live box; box of cover glasses; stops (2); mechanical stage; Wenham prism; standing case
Object number: 1327
Bausch & Lomb Optical Company
Date: 1883-1884
Accessories: objectives (3): 1/8, 1/4, 3 inch; oculars (2): B1, B2.
Object number: 1149
Joseph Zentmayer
Date: circa 1868
Accessories: paired oculars (2); objectives (6); box with observation discs and stage; slides; cover glass gauge; case
Object number: 1337
Joseph Zentmayer
Date: circa 1870
Accessories: paired oculars (2); Ernst Gundlach objectives in canisters (2); drawing camera; bull's eye and stand; substage condensor with disc diaphragm; drawing prism; standing case.
Object number: 1036
W. Watson & Sons Ltd.
Date: circa 1885
Accessories: oculars (2 pairs): B and D; objectives in marked canisters (4): 1/4, 1/2, 1, 3 inches; condenser with iris diaphragm; rotating wheel diaphragm; iris diaphragm; set of 4 disk diaphragms in brass box; triple nosepiece; live box; prisms for Wenham binocular system (2); stage for simple microscope with rotating wheel diaphragm; vulcanite stage; spare knobs (2); parts box; case
Object number: 1249