Cylindrical sundial with installation indicia

Details Cylindrical sundial with installation indicia Cylindrical sundial with installation indicia

1988-02-26

1989-06-06

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Celestial

33392, G01C 1734, G01C 2102, G04B 4902

Patent

active

048358754

ABSTRACT:
A universal sundial which indicates watch time is constructed from a standard pipe section or cylinder with one end an elliptical plane at an angle to the axis of the cylinder preferably within approximately 15.degree. of the latitude of the proposed site. The gnomon is a small sphere located at the center of the elliptical plane end. Time, sun declination, latitude, and meridian displacement indicia are all located on the inner surface of the cylinder by angular coordinates from the center of the gnomon. Two cylinder or two removably attachable overlays are required for indication of civil time for a full year. The sundial is set up by orienting it so the shadow of the gnomon indicates the correct time when the gnomon is in a vertical position over the site latitude and meridian or meridian displacement indicia.

REFERENCES:
patent: 281527 (1883-07-01), Larsen
patent: 1584194 (1926-05-01), Sautter
patent: 4028813 (1977-06-01), Eldridge
patent: 4081911 (1978-04-01), Eldridge
patent: 4237611 (1980-12-01), Wurch et al.
patent: 4355470 (1982-10-01), Doyle
patent: 4384408 (1983-05-01), Bohlayer

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