Method of and apparatus for telling time at night

Details Method of and apparatus for telling time at night Method of and apparatus for telling time at night

1982-11-22

1985-04-23

Haroian, Harry N.

Geometrical instruments

Straight-line light ray type

Celestial

G01C 1734

Patent

active

045120854

ABSTRACT:
An instrument for telling time at night includes a base that has a central aperture for sighting on Polaris and an annular hour scale inscribed on the base with the axis of the aperture as the center of the annulus, a calendar scale rotatable on the base about said axis and having indicia adapted to be aligned with the indicia on the hour scale, and a pointer rotatable about said axis and arranged to be removably secured to the calendar scale with its indicating edge in alignment with a selected mark on the calendar scale.

REFERENCES:
patent: 340452 (1886-04-01), Morse
patent: 1044238 (1912-11-01), Pilkington
patent: 1620980 (1927-03-01), Meacham
patent: 1875756 (1932-09-01), O'Sullivan
patent: 2006075 (1935-06-01), Lofgren
patent: 2532324 (1950-12-01), Milligan
patent: 2582179 (1952-01-01), Thomson
patent: 2657525 (1953-11-01), Allen
patent: 2918725 (1959-12-01), Ellsworth
patent: 3073032 (1963-01-01), Fleming
patent: 3940859 (1976-03-01), Troseth
patent: 4103429 (1978-08-01), Wagoner
J. Br. Astro. Assoc., 4/1977, "A Nocturnal", by D. Tattersfield

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