filar micrometer
Datecirca 1900
Inventory Number1997-1-0804
ClassificationFilar Micrometer
Subject
Maker
Bausch & Lomb Optical Company
1853-present
Cultural Region
Place of Origin
Dimensions7 x 4.5 x 14.5 cm (2 3/4 x 1 3/4 x 5 11/16 in.)
case: 9 x 9 x 16.2 cm (3 9/16 x 3 9/16 x 6 3/8 in.)
case: 9 x 9 x 16.2 cm (3 9/16 x 3 9/16 x 6 3/8 in.)
Material
Accessoriescase
Bibliography
DescriptionFilar micrometer of brass with nickel-plated drum micrometer head, accompanied by a leather case.
Signedon instrument: BAUSCH & LOMB OPTICAL CO. / Rochester, N.Y.
Curatorial RemarksFine condition
FunctionAccording to the B & L catalogue of 1900, the "Filar Micrometer is used for making the most accurate measurements possible under the microscope. The measuring apparatus consists of a horizontal cross-hair stretched across the field, a vertical reference cross-hair adjustable so that it may be made to coincide with the edge of the object to be measured and a moveable cross-hair moved by means of an accurate micrometer screw with graduated head reading to 0.005 mm. In the field, a comb with teeth corresponding with one revolution of the screw serves to record the number of revolutions."
Fauth & Company
Date: circa 1885
Accessories: spare parts, wood case
Object number: 1996-1-0028
Wm Gaertner & Company
Date: 1900-1920
Accessories: micrometer eyepiece, eyepiece adaptor
Object number: 1997-1-1836
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: 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
Troughton & Simms
Date: circa 1875
Accessories: 3 eyepieces; 1 diagonal; 1 set of shades; magnifier; dust cap; case.
Object number: 1996-1-0566
Bausch & Lomb Optical Company
Date: 1950-1960
Accessories: case
Object number: 1998-1-0490
Bausch & Lomb Optical Company
Date: circa 1903
Accessories: eyepiece; objectives (3): "Variable", 2/3" 0.24 NA, 1/6''; triple nosepiece; substage including Abbe condenser; revolving mechanical stage
Object number: 2002-1-0055
Bausch & Lomb Optical Company
Date: circa 1950
Accessories: oculars (4): 1 pair B&L 15x wide field, 1 pair 10x ; B&L achromatic objectives (3): 97x, 43x, 10x.
Object number: 2003-1-0071