Modern sundial

Details Modern sundial Modern sundial

1979-01-17

1982-08-31

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Celestial

G04B 4900

Patent

active

043465218

ABSTRACT:
The disclosure relates to a sundial employing a new type of gnomon comprising an opaque design printed on a plate of transparent material. The sundial described is designed for use in a specific locale, thereby enabling greater accuracy. The design of the casing of the sundial is therefore influenced by the choice of where it is to be used.

REFERENCES:
patent: 89585 (1869-05-01), Johnson
patent: 303118 (1884-08-01), Christian
patent: 783245 (1905-02-01), Clarke
patent: 794787 (1905-07-01), Crehore
patent: 1651621 (1927-12-01), O'Sullivan
patent: 2072565 (1937-03-01), Moehle
patent: 2846768 (1958-08-01), Putnam
patent: 3417473 (1968-12-01), Troseth

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