Equatorial sundial

Details Equatorial sundial Equatorial sundial

1981-01-12

1982-10-26

Little, Willis

Geometrical instruments

Straight-line light ray type

Celestial

G01C 1734

Patent

active

043554709

ABSTRACT:
An equatorial sundial according to this invention includes a dial surface and an elongated, rod-like gnomon fixedly secured in operative relation thereto. The dial surface is generally semi-cylindrical and concave toward the sun. The circumferential portion of the surface is further formed in the shape of a partial helix. The gnomon lies on the axis of the dial surface such that the longitudinal extent of the surface is transverse of the gnomon at an obtuse angle thereto. In a given geographical location, the sundial is so oriented relative to the earth that the gnomon is parallel to the earth's axis of rotation. With a proper pitch of the helical form of the dial surface, the opposite end portions thereof are offset in a direction parallel to the axis of the gnomon so that neither shade the dial surface either in the morning or evening.

REFERENCES:
patent: 281527 (1883-07-01), Larsen
patent: 849683 (1907-04-01), Hewitt
patent: 4135357 (1979-01-01), Ashton

Affiliated with

Also associated with

Rating

Equatorial sundial does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Equatorial sundial, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Equatorial sundial will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-942952