Browse Items (68 total)

photometer1.jpg
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.…

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DSCN0073.JPG
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.

moonphasechart.gif
Graph of the moon's brightness with phase from the first application of the selenium cell photometer.

countingmachine.jpg
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…

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30inch1925.jpg
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…

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DSCN0018.JPG
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…

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DSCN0189.JPG
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.

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DSCN0183.JPG
Model no. 89, no. 18. Box is 8 ¼ x 8 ½ x 12 inches and screwed closed. Unknown date but estimated around 1920-1925 although could be earlier. Used with the selenium cell photometer to measure current and with the photoelectric cell photometer.

DSCN0108.JPG
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…

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DSCN0788.JPG
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…
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