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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…
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”…
Photograph Ross Camera and Fauth finderscope
Photograph of the 4-inch Ross-Fecker camera with the 4-inch Fauth refractor as the finderscope.
The instrument was a refractor of 4-inch aperture and 28-inch focal length (f/7) with a scale of 290”/mm. It held 8x10 inch glass plates covering 20…
The instrument was a refractor of 4-inch aperture and 28-inch focal length (f/7) with a scale of 290”/mm. It held 8x10 inch glass plates covering 20…
4-inch reflector Celestar
Metal, glass, wood
Celestar telescope with fork-type mounting and electric drive. Includes wood tripod, slow motion adjustment both axes, right ascension and declination setting circles and achromatic 30 mm finder scope. A chain links the three…
Celestar telescope with fork-type mounting and electric drive. Includes wood tripod, slow motion adjustment both axes, right ascension and declination setting circles and achromatic 30 mm finder scope. A chain links the three…
Kunz Photoelectric cells
The photocell is hand blown glass or quartz. Within in the cell is an alkali metal (lithium, sodium, or potassium) that covers the inside and is a cathode emitting electrons when illuminated. A well insulated wire forming a ring centered in the…
Lantern slide "Nova Geminorum no. 2 (Dr. Curtis)"
This lantern slide is marked "Property of Joel Stebbins." One of several lantern slides so marked, they all seem to connect to his dissertation completed in 1903. This slide is found in the Observatory lantern slide collection and is marked Sp22.
2-day Marine Chronometer
Mahogany wood, brass, silver, glass
Chronometer of 56-hour duration is set in gimbals in a mahogany box. Serial number #2805. John Bliss and Company was active 1857-1956.
Marine chronometer within wood box with hinged lid measuring 7-inches…
Chronometer of 56-hour duration is set in gimbals in a mahogany box. Serial number #2805. John Bliss and Company was active 1857-1956.
Marine chronometer within wood box with hinged lid measuring 7-inches…
Visual spectroscope
Wood, brass, glass
Comes with large wooden box with hinged lid (24” x 14” x 8”), 12”tall stand (obs 726), and accessories. It includes a dense flint prism and a reflection diffraction grating. Crosshairs and a precise scale permit the measurement…
Comes with large wooden box with hinged lid (24” x 14” x 8”), 12”tall stand (obs 726), and accessories. It includes a dense flint prism and a reflection diffraction grating. Crosshairs and a precise scale permit the measurement…
30-inch mirror
Wood, metal, glass
Frustrated by the selenium cell photometer's lack of sensivity, Joel Stebbins purchased a large 30-inch reflector in 1912. The original telescope was purchased from C.W. Draper, $1500, #573, July 26 1912. It has previously been…
Frustrated by the selenium cell photometer's lack of sensivity, Joel Stebbins purchased a large 30-inch reflector in 1912. The original telescope was purchased from C.W. Draper, $1500, #573, July 26 1912. It has previously been…
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…