Hemispherical sundial with installation indicia

Details Hemispherical sundial with installation indicia Hemispherical sundial with installation indicia

1989-02-01

1990-08-07

Will, Thomas B.

Geometrical instruments

Straight-line light ray type

Celestial

33269, G04B 4904, G01C 1734

Patent

active

049456440

ABSTRACT:
A sundial with a concave hemispherical body and top surface generally horizontal has longitude displacement, latitude, sun declination, and time indicia originating at the spherical gnomon located at the spherical center of the hemisphere. Site set up is accomplished by plumbing the gnomon over the site latitude and longitude displacement indicia and then rotating on a horizontal surface until the correct time is indicated by the shadow of the gnomon from the sun. Two six-month sundials or two removably attachable inserts are used for indication of watch time for complete years.

REFERENCES:
patent: 752717 (1904-02-01), Smith
patent: 794787 (1905-07-01), Crehore
patent: 1651621 (1927-12-01), O'Sullivan
patent: 1674161 (1928-06-01), Bogory
patent: 2205357 (1940-06-01), Hagner
patent: 2460346 (1949-02-01), Hagner
patent: 3303567 (1967-02-01), Blauks
patent: 4081911 (1978-04-01), Eldridge
patent: 4384408 (1983-05-01), Bohlayer
patent: 4520572 (1985-06-01), Sphilhaus
patent: 4835875 (1989-06-01), Fuller

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