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IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections.
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https://iiif.si.eduView ManifestView in Mirador ViewerUsage Conditions May ApplyUsage Conditions ApplyThere are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page.
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This is a filar micrometer, likely made by Brashear of Pittsburgh, and used visually on the 24 inch refractor of the Sproul Observatory, Swarthmore College since its opening in 1913. It contains tiny electrical lamps, and some later modifications. Designed by Klages of Brashear, it connects to telescope by bayonet mount. Filar micrometers were precursors for double star positional astronomy and astrometry prior to the photographic era.
Swarthmore College donated this set of objects to the Museum in 2017.
Display Status
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin
United States of America
Type
EQUIPMENT-Scientific Devices
Manufacturer
John Brashear, American Dimensions
3-D: 34.3 × 30.5 × 21.6cm, 14.4kg (1 ft. 1 1/2 in. × 1 ft. × 8 1/2 in., 31.7lb.) Materials
Aluminum Alloy
Copper Alloy (Including Possible Brass)
Ferrous Alloy
Paint
Glass
Plastics
Adhesive
Wood
Adhesive Tape
Electrical Wiring
Rubber Inventory Number
A20200004000
Credit Line
Gift of C. Stuart Hain, Swarthmore College
Data Source
National Air and Space Museum
Restrictions & Rights
Usage conditions apply
For more information, visit the Smithsonians Terms of Use.