Ultraviolet sundial

Details Ultraviolet sundial Ultraviolet sundial

1994-12-16

1996-11-19

Fields, Carolyn E.

Radiant energy

Invisible radiation responsive nonelectric signalling

G01J 138

Patent

active

055765513

ABSTRACT:
A device for indicating the percentage of ultraviolet radiation which reaches the earth's surface for a given position of the Sun's altitude. The device consists of a planar member having a gnomon-like member affixed within its center. The gnomon-like member marks the center of nine (9) spaced concentric rings inscribed on a top surface of the planar member. The innermost circle is labeled 90%, the second 80% and so on to an outer edge. The radius for the circumference of each ring is calculated by a mathematical formula which correlates the altitude of the sun with a percentage amount of UV-B that reaches the surface of the earth.

REFERENCES:
patent: 157586 (1874-12-01), Devlin
patent: 1270505 (1918-06-01), Fields
patent: 1496403 (1924-06-01), Atkinson
patent: 2536328 (1951-01-01), Triplett
patent: 2904889 (1959-09-01), France, II
patent: 3412494 (1968-11-01), Vogel
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patent: 4237611 (1980-12-01), Wurch
patent: 4346521 (1982-08-01), Luft
patent: 5028792 (1991-07-01), Mullis
patent: 5173609 (1992-12-01), Lacoste et al.
patent: 5186630 (1993-02-01), Tien

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