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Compass
There are three Astro Compass Mark II, in green wooden boxes with canvas handles. It can be pointed at a known star, including the sun, and used to indicate true north. Manual included.
Bubble sextant
Wood, metal alloy, plastic
Marked property Air Force-US Navy, type A-10A. Probably WW II era. Blackened aluminum casting, containing clockwork, lenses, mirrors, buddle level, and rubber eyecup. In fitted wooden box. A small rugged aircraft…
Marked property Air Force-US Navy, type A-10A. Probably WW II era. Blackened aluminum casting, containing clockwork, lenses, mirrors, buddle level, and rubber eyecup. In fitted wooden box. A small rugged aircraft…
Algol light curve
Joel Stebbins used the selenium cell photometer to study the known variable star Algol. The improved accuracy of the photometer revealed the second minimum and the limb darkening.
Selenium cell photometer
Figure 1: Selenium cell in ice-pack attached to 12-inch refractor. Page 190.
Galvanometer room
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…
Visible in the photograph are the galvanometer, reading telescope, scale, batteries,Wheatstone bridge, and resistance boxes. Was located in the west-central transit…
Sextant and artificial horizon
Wood, metal, glass
Sextant:
Wooden box with hinged lid, inside includes Keuffel & Esser paper label and “obs 15” mark. Sextant matched with artificial horizon A214.2.
Black metal frame, wood handle, silver scale, maker marked on index arm,…
Sextant:
Wooden box with hinged lid, inside includes Keuffel & Esser paper label and “obs 15” mark. Sextant matched with artificial horizon A214.2.
Black metal frame, wood handle, silver scale, maker marked on index arm,…
Sidereal clock, no. 22
Wood, metal, glass
Wooden mahogany case, there was a spare wooden case, height 59.25 cm, width 44 cm, depth 20 cm. There are two front glass doors, one for the dial and one for the pendulum. The sides are wood paneling for the pendulum and glass…
Wooden mahogany case, there was a spare wooden case, height 59.25 cm, width 44 cm, depth 20 cm. There are two front glass doors, one for the dial and one for the pendulum. The sides are wood paneling for the pendulum and glass…
Sextant
Wood, metal, glass
Black aluminum frame, wood handle, one telescope, no filters, micrometer wheel on vernier scale, arc is black with white engraved scale from 0 to 140. Marked on index arm “U.S. Navy Bureau of Ships ETS Sextant, Mark 2 Mod 0…
Black aluminum frame, wood handle, one telescope, no filters, micrometer wheel on vernier scale, arc is black with white engraved scale from 0 to 140. Marked on index arm “U.S. Navy Bureau of Ships ETS Sextant, Mark 2 Mod 0…
Sextant
Wood, metal, glass
Wood box, 9 7/8 x 9 7/8 x 5 ½ inch, with hinged lid, two hook latches and metal handle. Maker’s laminated paper label and university ID tag on inside. While the last inspection date on this sextant is 1939, the last sextant made…
Wood box, 9 7/8 x 9 7/8 x 5 ½ inch, with hinged lid, two hook latches and metal handle. Maker’s laminated paper label and university ID tag on inside. While the last inspection date on this sextant is 1939, the last sextant made…
Postcard," Looking north on campus, University of Illinois"
Postcard looking down Mathews Avenue at the south side of the Observatory. Behind the Observatory are visible the weather station, a small observatory containing a 4-inch refractor, and several small brick piers for portable instruments. The…