Heliochron

Details Heliochron Heliochron

1989-08-07

1989-12-26

Miska, Vit W.

Horology: time measuring systems or devices

Astronomical

33270, G04B 1926, G01C 1734

Patent

active

048902691

ABSTRACT:
A helichron having a box-like housing to which a cover is pivotally hinged. A magnetic compass is positioned in the box-like housing at a predetermined directional orientation. A 360 degree spirit level is also positioned within the box-like housing. The top surface of the cover has an hour scale recess having a semi-circular wall portion and a planar surface portion. An Arabic numbers hour scale is imprinted on the semi-circular wall to denote hours for the northern hemisphere and a Roman numeral hour scale is imprinted on the horizontal planar surface to denote hours for the southern hemisphere. There is a gnomon and structure for mounting its bottom end in the horizontal planar surface of the hour scale recess. There is also a latitude scale member attached to the bottom surface of the cover whose index is set to the users latitude by varying the angle of the cover.

REFERENCES:
patent: 2963790 (1960-12-01), Hall
patent: 3786570 (1974-01-01), Davies
patent: 4034549 (1977-07-01), Danley et al.
patent: 4237611 (1980-12-01), Wurch et al.
patent: 4255864 (1981-03-01), Glendinning
patent: 4645354 (1987-02-01), Mercer
patent: 4656748 (1987-04-01), Thual

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