Time

Title

Time

Description

One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.

Contributor

Department of Astronomy

Items in the Time Collection

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…

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…

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…

Master clocks
Wood, glass, metal

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” Arabic dial, white with black…

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. The clock is now in the collection of the Adler Planetarium in Chicago

"The Riefler clock has two interesting characteristics. …

Radio receiver
Metal, glass

Model EC 1 Echophone commercial, 6 tube, AC-DC, three band, 545 KC-30.5 MC, 12 x 12 x 8.4 inch / 305 x 305 x 213 mm. Paper manual included. Was used in the clock room to provide a time signal to the chronograph. In the late 1950s…

Self winding clock
Wood, metal, glass

Purchased by the Astronomy Club in 1985 at an estate sale, the clock was missing the dial and door but still retained the wooden case, paper instructions, wires, hands, pendulum, and clock mechanism. In 2011, Dr. Bruce Hannon…