Sundial

Details Sundial Sundial

1981-06-03

1983-02-15

Haroian, Harry N.

Geometrical instruments

Straight-line light ray type

Celestial

G04B 4900

Patent

active

043732704

ABSTRACT:
A sundial comprising a block of transparent material in the general form of a frustrum of a semi-cylinder, with first planar surface at an angle to the cylindrical axis that corresponds as nearly as may be to the complement of the angle of latitude at which the device is to be used, a second diametrical surface that has a medial index or gnomon line coincident with the cylindrical axis, and with a plurality of concave flutes on the cylindrical surface extending parallel to the cylindrical axis and providing, between adjacent ones, narrow, flat, translucent, substantially linear surfaces fifteen degrees apart.

REFERENCES:
patent: 783245 (1905-02-01), Clarke
patent: 2668357 (1954-02-01), Whipple
patent: 3786570 (1974-01-01), Davies

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