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Reading telescope
Metal, glass
Eyepiece with crosshairs, 12-inch tall, 11-inch long, tube 1-inch outer diameter, missing an objective lens.
Used with galvanometer to read the reflection off the mirror.
Eyepiece with crosshairs, 12-inch tall, 11-inch long, tube 1-inch outer diameter, missing an objective lens.
Used with galvanometer to read the reflection off the mirror.
Reflection galvanometer
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. …
Master clocks
Wood, glass, metal
They are model 25 IBM Master clocks. There are two 60 beat with a Graham dead-beat escapement with micrometer adjustment. Magnet wound, spring drive, self-regulating movement, 63 1/6” x 19 ¼” x 7 5/8”, plain glass door, 12”…
They are model 25 IBM Master clocks. There are two 60 beat with a Graham dead-beat escapement with micrometer adjustment. Magnet wound, spring drive, self-regulating movement, 63 1/6” x 19 ¼” x 7 5/8”, plain glass door, 12”…
Collimator lens and meridian mark
Metal, glass
Measures 8 ¼ x 6 x 11 ½ inches, lens is 1.7” in diameter.
Director G.W. Myers articulated the need for a Meridian or mire Mark in a March 6, 1897 letter to university President Draper. “Mire mark and Collimator for 3-inch Combined…
Measures 8 ¼ x 6 x 11 ½ inches, lens is 1.7” in diameter.
Director G.W. Myers articulated the need for a Meridian or mire Mark in a March 6, 1897 letter to university President Draper. “Mire mark and Collimator for 3-inch Combined…
Reflection horizon
Black glass ground plane surface, 3 3/8 diameter, 3 leveling screws, fine graduated adjustable spirit level, and mahogany case.
In the 1913 Keuffel & Esser catalog (page 413) the reflecting horizon cost $16. The reflecting horizon is an…
In the 1913 Keuffel & Esser catalog (page 413) the reflecting horizon cost $16. The reflecting horizon is an…
Cabin sidereal clock
Aluminum, brass, glass
There are two sidereal clocks, both are electric. The first is 9 ½-inch diameter with a 8-inch dial, black metal base, brass and glass, 3 hands.
The second smaller clock 5 ¼-inch diameter, tag indicates a date of…
There are two sidereal clocks, both are electric. The first is 9 ½-inch diameter with a 8-inch dial, black metal base, brass and glass, 3 hands.
The second smaller clock 5 ¼-inch diameter, tag indicates a date of…
Mercury stick barometer
Wood, metal, glass, mercury
Housed in wooden box with glass sides, hinged wood/glass door, case is 9 ¼ x 6 ¼ x 50 ¾ inches. Originally kept in the entrance hall on the west wall, just north of the door to the transit rooms. Glass on front door…
Housed in wooden box with glass sides, hinged wood/glass door, case is 9 ¼ x 6 ¼ x 50 ¾ inches. Originally kept in the entrance hall on the west wall, just north of the door to the transit rooms. Glass on front door…
Drum chronograph
Metal, wood, glass
The chronograph, made by Warner and Swasey, is permanently mounted in the clock room. Includes wooden box (9 ¼ x 6 ¼ x 50 ¾ inches) connected to counter-weights and pulleys attached to the ceiling. It consists of a brass…
The chronograph, made by Warner and Swasey, is permanently mounted in the clock room. Includes wooden box (9 ¼ x 6 ¼ x 50 ¾ inches) connected to counter-weights and pulleys attached to the ceiling. It consists of a brass…
Engineer transit telescope
Metal, glass, wood
There are two transits. The first is transit includes compass and is marked no. 898. Objective is 1-inch diameter and tube is 8” long. One frosted glass shade is missing.
The second transit is marked no. 862 and comes with a…
There are two transits. The first is transit includes compass and is marked no. 898. Objective is 1-inch diameter and tube is 8” long. One frosted glass shade is missing.
The second transit is marked no. 862 and comes with a…
Heliostat foucault
Metal, glass
Also Foucault siderostat. Marked “Societe Genevoise, pour la construction, D’instruments de physcique, Geneve.” Wind up drive does not work. Spirit level on black metal base with 3 leveling screws.
Siderostats are used with a…
Also Foucault siderostat. Marked “Societe Genevoise, pour la construction, D’instruments de physcique, Geneve.” Wind up drive does not work. Spirit level on black metal base with 3 leveling screws.
Siderostats are used with a…