1
10
1
-
https://d1y502jg6fpugt.cloudfront.net/1868/archive/files/bcf4a70911f46396f671ca8dc1959e5b.JPG?Expires=1712793600&Signature=Po0hdrAq8wcLj9XNxnQegDmIrFOAAO3PUxt%7EeMnIxZTjy7Jo38h7Mef6%7EOt3-S9%7E%7Eo9AXuqnLVhg-toN26PamS8BuQqgAajg1MJkvZOHnIGYhNgjEyT5loGQMFfXqiaUZLRohXhA7gp%7EH2JlXDeR-05N4lisPX0KbsCve92m7qctl3NHOPMetBwyYI2w-I1XeDJV0Vd-v7T7HoB2c91N7Xiqo1-9u%7EDk6AobPSVgH5Pft5kl4hlzMg-F38B2ERiTXMWaRqqmlnVajqjeaDSMlvn2hVb7mUpTZhoYLZJV7Sg35DZ4kjPhl2QVYuJrBqnJ7S2IkWDL9w5QxCfEEv2QqA__&Key-Pair-Id=K6UGZS9ZTDSZM
6d3e04b1e4fce08dd203a8917ca531b1
Omeka Image File
The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files.
Bit Depth
8
Channels
3
Height
3943
Width
3240
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
filar micrometer
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
https://d1y502jg6fpugt.cloudfront.net/1868/archive/files/623884f53bd083d15ea0caa1d3e66d01.JPG?Expires=1712793600&Signature=InU-BV06Q37KjZffZZ0xWHEBEp8YgqFHP-3cLGgkNiCTGjWfwDmSUFvvUCb1uoGlvoamjfdLwbiBGWrGdirdLDdGLI7BMesX6fFdu8zbXNRdS6aBYbfy3Im4U5V-n1hEoGbCh6i%7EmAshuaAxbwfU94rN8W%7EevhyYawh53YUKL78bNcAtQS5KZfNo-bAaDyxSHYGRCHf3RdngFGHakSEvnSHc7j5tSvJwqeH5va1nXvNzx5CSvHCj%7EKxC4U0uBXwvijWaTPNN0FtRiwiXi5KZ9Hc2ftgVVn2s6-uS52KPIXGxbCqFh9yBZNXbPGNOxsv07vSImB1vpXdKAV%7EEyxPy7w__&Key-Pair-Id=K6UGZS9ZTDSZM
29ee9cd2fd1d0eb1081d059dda1564dc
Omeka Image File
The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files.
Bit Depth
8
Channels
3
Height
3240
Width
4320
https://d1y502jg6fpugt.cloudfront.net/1868/archive/files/e22fc73a517db9761e08add4b09e8c6d.JPG?Expires=1712793600&Signature=dg3LzIWmZrdiHH2bBHFg1O-besj7kqnTEC4nDr39ZaMKWA2ly46bxzmn32hjpO9GFj67EK1YZnT2Nm%7EJQtwh6SybiY-FCI0gHGdTNSGedduP9t40tpNGf8178GfW4otIumGtWfJj27EEoE2ok4dNHMsZVkhQVTbE%7EbMYhx7WZIPMHX3mPiFEPeg4Al7bKeAxTcwpzTWoTFqslBgc9flpgqvJIz7FZqvl-1IjqpWNuo4Ovnxsg3Oyjrvwn4KUaje3RQ6GuI5H%7ES2B8VBoxyQdmNqE89EYEJBSco7pPe0kk3BW2sqp-yh1%7E8Z%7E40F8RB7bkTt9lRnWI9GSudtUM6o7Vw__&Key-Pair-Id=K6UGZS9ZTDSZM
5741bfda1cab7063b09606d316633d7a
Omeka Image File
The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files.
Bit Depth
8
Channels
3
Height
3240
Width
4320
https://d1y502jg6fpugt.cloudfront.net/1868/archive/files/167720eadad90f5693753ab5a6c241cf.pdf?Expires=1712793600&Signature=j7quTcvWo6hW5DZvjHGkcQZYnRC37zMiEBRx2%7ESG04bbLja8f43GLzZw0Pc7H0o1jfKBysbyklexVK4%7EytuuEbX7VrKdCbOeWoSdKNMq8kb6kNPm8E7VF7y93RA7mzi1Ki3kc7AOaJfqDsvZXNyCNqw%7EhRZ3%7EfbCRtEPdc7MBdLpR8oGA%7EIZwMYR1zEJlTUgvq2gyeIC5QdQevfSDHE5M9uF%7EYE9MHajjkKCBzHh95KDAuUorgs7uDJq%7E4PAeDZ3RmA0Z1iZnujuCjGjOg74U%7ENO1-D0lqbApMHVOg2akPdxy-sxB5O9HAinzG5DtkjNqXDoZ4qqSlOo4dAfCFF1DA__&Key-Pair-Id=K6UGZS9ZTDSZM
50975c20b583eb47389a282dc8b8bd23
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Instrument collection
Description
An account of the resource
For most of human history, our eyes served as the recording device for our observations of the night sky. Later, developments in photography began to change how we viewed and documented astronomical observations. The instrument collection consists of auxiliary instruments used on the 12-inch equatorial refractor. Some of the instruments such as the filar micrometer and spectroscope were designed for use with human eye as the detector, others such as the plate camera used film.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Filar micrometer
Subject
The topic of the resource
Astronomy
Measuring instrument
Optical instrument
Description
An account of the resource
Wood, brass, glass
Wooden box (dimensions) with hinged lid, with 4 colored shades (2 green, 2 red), 3 eyepieces with adapter, one smaller eyepiece with adapter, accessories for light.
“Its filar position micrometer consists essentially of a position circle 6.3 inches in diameter, graduated on silver to half degrees and read by to verniers to tenths of a degree and a very accurately threaded screw, carrying a light frame holding the micrometer wires. Whole revolutions of the screw are read by a toothed wheel and fractional parts of the screw are given by a drum of 2.5 inches diameter whose circumference is graduated to hundredths. Tenths of divisions are readily estimated. The micrometer box is moveable in position angle, the entire system of threads fixed and movable is carried ‘in distance’ by a screw without graduations and the eye piece is adjusted to the center of the fields by a still different screw.”
A filar micrometer is used for precision positional astronomy by measuring the separation or angular distance between two objects. In addition it can measure the position angle between them. They were often used to measure the angles and distances between double stars. Data gathered over long periods of time could demonstrate the orbit of one star about the other star. Micrometers are seldom used on modern astronomy having been replaced by newer techniques.
This micrometer came with the Equatorial. Stebbins used it to measure size of crater Linné during February 8, 1906 lunar eclipse. Cleaned by J.W. Fecker in 1954.
Creator
An entity primarily responsible for making the resource
Warner & Swasey Company
Source
A related resource from which the described resource is derived
Myers, G.W. (1898) The Astronomical Observatory. Technograph. 11: 105-111.
Stebbins, J. (1906) Observations of the crater Linné during the lunar eclipse of February 8, 1906. Astronomical Journal. Vol. 25. No 587, p. 87-88.
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
1896
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
Language
A language of the resource
English
Type
The nature or genre of the resource
physical object
Identifier
An unambiguous reference to the resource within a given context
University of Illinois Observatory Collection A102
University ID 016717, obs 735
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
micrometer