Sundial-like timepiece

Details Sundial-like timepiece Sundial-like timepiece

1993-09-03

1994-11-15

Roskoski, Bernard

Horology: time measuring systems or devices

Displays or display device details

Optical

368240, G04B 1906

Patent

active

053654986

ABSTRACT:
A sundial-like timepiece comprising a conventional clock mechanism including a surface having a plurality of time interval markings inscribed thereon. A light source is attached to the clock mechanism and is disposed a spaced distance from the surface. The light source is moved relative to the surface by the clock mechanism on either a twelve or twenty-four hour cycle. A gnomon is disposed in such a position relative to the surface that the light source causes a shadow of the gnomon to be cast onto the surface. As the light source moves relative to the surface, the shadow moves across the time interval markings, and time can be read off the timepiece by observing the position of the shadow relative to these markings. If the light source is not functional, the time cannot be read off the timepiece.

REFERENCES:
patent: 666381 (1901-01-01), Gareau
patent: 2351238 (1944-06-01), Teuber
patent: 2486425 (1949-11-01), Loewe et al.
patent: 3156990 (1964-11-01), Dock
patent: 3832842 (1974-09-01), Parker
patent: 4034549 (1977-07-01), Danley et al.
patent: 4036009 (1977-07-01), Sampson
patent: 4374623 (1983-02-01), Simon
patent: 4858209 (1989-08-01), Chaut

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