Photograph 'Photoelectric photometer'
Astronomy
Photography
Photometry
Measuring instruments
Optical instruments
Photograph of the photoelectric cell photometer attached to the 12-inch refractor. The photograph dates to about 1913-1915. During the summer of 1915, Dr. Stebbins took this photometer to Lick Observatory to study the variable star Beta Lyrae. Photographs of that photometer on the Lick 12-inch telescope match this photograph of the photometer on the Illinois 12-inch telescope.
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1915
still image
English
still image
University of Illinois Observatory, Urbana, Illinois
Glass plates
Astronomy
Photography
Two examples of approximately 270 photographic plates and films taken with the 12-inch refractor and the plate camera. Most of the photographs date to the late 1950s and early 1960s.
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1960
Michael Svec
Copyright Michael Svec
still images of physical artifact
English
physical object
University of Illinois Observatory, Urbana, Illinois
Moon's light with a selenium photometer
astronomy, photometer
Graph of the moon's brightness with phase from the first application of the selenium cell photometer.
Brown, F.C., & Stebbins, J. (1907). A determination of the Moon’s light with a selenium photometer. Astrophysical Journal. 26, 326-340.
Astrophysical Journal
1907
English
University of Illinois Observatory, Urbana, Illinois
Lantern slide "Counting Machine"
Astronomy
Photography
Measuring instrument
Lantern slide of the Observatory's counting machine. This piece of equipment was used by the third director, Robert Baker, to analyze photographic plates of the Milky Way during his research 1938-1951. The lantern slide is part of the Observatory's lantern slide collection and is labeled "PE 24."
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1940
still image
English
University of Illinois Observatory, Urbana, Illinois
Lantern slide '30-inch Reflecting telescope'
Astronomy
Photography
Optical instrument
Telescope
Architecture
Lantern slide of the 30-inch reflecting telescope after it was rebuilt between 1925-1927. The dual-channel photoelectric photometer hangs on the end of the telescope. The rebuilt telescope was located in a 15-foot domed Observatory located on Florida Avenue south of Mount Hope Cemetery. The telescope was rebuilt by the local firm of J.B. Hayes for $1560 starting in January 1925. Baker announced its completion at the American Physical Society's annual meeting on December 29, 1927. This lantern slide is part of the Observatory's collection and is marked "PE 9."
Baker, Robert H. "The 30-inch Reflecting Telescope and Photoelectric Photometer of the University of Illinois." Popular Astronomy. 122:86-91.
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1925
still image
English
University of Illinois Observatory, Urbana, Illinois
DC Voltmeter
Electrical apparatus
Measuring instruments
Wood, metal, paper, glass
Model 45, No. 32664, in oak box measuring 7 7/8 x 5 3/8 x 7 7/8 inches, with leather handle, 2 scales 0-150, 0-15. Paper label dated November 5, 1926. All hardware is nickel-plated brass. The front panel and meter face plate are of heavy cast iron with a fine diamond pattern on the casting. Iron parts have a "japanned" black enamel finish. The binding posts are of black Bakelite. The meter has a mirrored scale
Weston Electrical Instruments Company, Newark, New Jersey
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1926
Michael Svec
Copyright Michael Svec
image/jpg
English
physical object
University of Illinois Observatory Collection A227
University ID 16768
University of Illinois Observatory, Urbana, Illinois
DC Voltmeter
Electrical apparatus
Measuring instrument
Wood, metal, glass
Weston DC voltmeter model #38635, dated September 1, 1923. Two scales 0-15 and 0-150. Box measures 7 ½ x 4 ½ x 7 ½ inches. Scale has mirrored scale.
Weston Electrical Instruments Company, Newark, New Jersey
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1923
Michael Svec
Copyright Michael Svec
image/jpg
English
physical object
University of Illinois Observatory Collection A195
University ID 16727, obs779
University of Illinois Observatory, Urbana, Illinois
Reflection galvanometer
Electrical apparatus
Measuring instrument
Model no. 89, no. 18. Box is 8 ¼ x 8 ½ x 12 inches and screwed closed. Unknown date but estimated around 1908. Used with the selenium cell photometer to measure current and with the photoelectric cell photometer. Visible in pictures of transit room. An unpublished photograph in the Jakob Kunz papers, University Archives, from the 1918 eclipse expedition shows this galvanometer sitting on a shelf in the background. A published picture from 1910 and another unpublished photo from 1912 show the same galvanometer.
Weston Electrical Instruments Company, New, New Jersey
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1908
Michael Svec
Copyright Michael Svec
Harvard Collection: http://waywiser.fas.harvard.edu/objects/2183/reflecting-galvanometer-with-moving-coil
image/jpg
English
physical object
University of Illinois Observatory Collection A193
obs52
University of Illinois Observatory, Urbana, Illinois
Eyepieces
Astronomy
Optical instrument
Telescope
Wood, brass, glass
Wooden box with hinged lid, spaces for 12 eyepieces. Includes 1 ¼-inch adapter, 2-inch adapter, 3-inch eyepiece (with cracked lens, visible in 1896 picture), 3-inch Fecker eyepiece with chipped lens, 2-inch right angle, 1 ¼-inch right angle with off-axis guide, 12 eyepieces of various magnifications.
Warner & Swasey, JW Fecker
Astronomy Department, University of Illinois, Urbana, Illinois
circa 1896
Michael Svec
Copyright Michael Svec
image/jpg
English
physical object
University of Illinois Observatory Collection A103, A104
obs823
University of Illinois Observatory, Urbana, Illinois
24 ft Dome and transit house shutter tracings
Astronomy
Architecture
Three tracings by Warner and Swasey for the University of Illinois.
1) 24 ft. Dome section, tracing B2860, dated April 21, 1896. Stamped with "University of Illinois Observatory."
2) 24 ft. Dome and 12-in Equatorial General Dimensions, tracing B-2859, dated April 20, 1896.Stamped with "University of Illinois Observatory."
3) Transit house shutter, tracing B-2883, Job 6351, dated May 1, 1896. Purchased by Astronomy Department in 1986.
Warner & Swasey, Cleveland Ohio
Astronomy Department, University of Illinois, Urbana
1896
Michael Svec
Copyright, Michael Svec
image/jpg
English
Document
University of Illinois Observatory, Urbana, Illinois