Browse Items (20 total)

transitroom.jpg
Figure 2: Galvanometer and accessories for the selenium photometer. Page 191.

Visible in the photograph are the galvanometer, reading telescope, scale, batteries,Wheatstone bridge, and resistance boxes. Was located in the west-central transit…

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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.

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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photometer2.jpg
Lantern slide of the photoelectric photometer around 1925. From the Observatory's lantern slide collection, marked "PE 2." Robert Baker continued Stebbin's photometry work when he arrived at Illinois in 1923. He continued to use the 12-inch…

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photocell.jpg
Lantern slide of a photoelectric cell made by Jacob Kunz. Part of the Observatory's lantern slide collection, marked "PE 5."

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30inch1915.jpg
Lantern slide of the 30-inch reflecting telescope purchased in 1914. The mirror had a focal length of 20-inches and was made by John Brashear. The mount might also be by Brashear. This lantern slide is part of the Observatory's collection and is…

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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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eclipsestation1918.jpg
One of over 1000 lantern slides in the Observatory's collection. Labelled "E1" this is a photograph of the photoelectric photometer Dr. Joel Stebbins and Dr. Jakob Kunz used to observe the solar eclipse on June 8, 1918. The photograph also appeared…

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DSCN0342.JPG
Both of these lantern slides were used by the first director, George W. Myers, at the conference opening Yerkes Observatory held October 18-21, 1897. Myers' work, "The system of Beta Lyrae" was published in the Astrophysical Journal in 1898 (vol. 7,…

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DSCN0160.JPG
Wood, glass, metal

In 2 wooden boxes, hand painted glass slides in mahogany wood, several with moving parts, total of 35 lantern slides. Similar collections on-line have them made of mahogany, with brass handles and movements, stamped and…

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