Geometrical instruments – Straight-line light ray type – Celestial
Patent
1987-06-22
1988-11-22
Haroian, Harry N.
Geometrical instruments
Straight-line light ray type
Celestial
G01C 1234
Patent
active
047855428
ABSTRACT:
A sundial which is characterized by a selectively portable or permanent base, a support plate hingedly connected to the base in adjustable angular relationship for effecting latitude adjustment to the sun's path and a connecting plate pivotally attached to the support plate, with a pair of semicylindrical dials secured to the connecting plate in oppositely-disposed relationship. A pair of gnomons are suspended outwardly of the concave dial curvatures, respectively, for casting a shadow on the dials and indicating the time of day and day of the year responsive to rotation of the earth and traversal of the shadow across the dials. Each gnomon is spherical in shape and is suspended in the center of a diameter of each of the dials and the connecting plate and dials are oriented at a selected angle with respect to the base, which angle is determined by the latitude at which the sundial is positioned. Each of the dials is further provided with hour and month markings to facilitate direct reading of the time of day and the approximate day of the month on the dials responsive to the sequential casting of the shadow by the gnomons.
REFERENCES:
patent: 303118 (1984-08-01), Christian
patent: 3417473 (1968-02-01), Troseth
patent: 4355470 (1982-10-01), Doyle
Haroian Harry N.
Harrison John M.
LandOfFree
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 Sundial, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sundial will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-427681