Electronic sundial apparatus

Details Electronic sundial apparatus Electronic sundial apparatus

1981-08-25

1983-06-14

Roskoski, Bernard

Horology: time measuring systems or devices

Astronomical

368 62, 33268, G04B 1926

Patent

active

043879993

ABSTRACT:
An electronic sundial apparatus which signals the passage of each hour by a chime, bell or other audible indication and which requires no external source of power other than the sun. Inner and outer concentric hemispheres with vertically extending apertures, specifically slits, configured so as to diverge at their uppermost ends and having a location, length and shape corresponding to the azimuths and distance between the maximum and minimum altitudes of the sun in the sky at each hour throughout the year at predetermined latitudes collimate the sunlight once each hour. The collimated sunlight is detected by a photoelectric cell coupled to a signaling circuit powered by a photovoltaic cell.

REFERENCES:
patent: 3440426 (1969-04-01), Bush
patent: 4135357 (1979-01-01), Ashton

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