Globe having means for indicating a day and night boundary

Details Globe having means for indicating a day and night boundary Globe having means for indicating a day and night boundary

1989-09-14

1990-11-20

Apley, Richard J.

Education and demonstration

Geography

Terrestrial globe or accessory therefor

434131, 434149, G09B 2700

Patent

active

049715593

ABSTRACT:
A globe, comprising: a stationary base; a day and night boundary ring mounted on the stationary base; an arm supported at its base end by the day and night boundary ring so as to be rotatable around a first axial line; and a spherical globe main body rotatably supported by a free end of the arm so as to be rotatable around its earth's axis; the first axial line defining the ecliptic angle with respect to a vertical line. According to this globe, the distribution of the regions of day and night in any time of the day and in any time of the year can be readily demonstrated by means of the day and night boundary ring simply by turning the globe body around the earth's axis and the first axial line, respectively, without using any complicated structure.

REFERENCES:
patent: 29755 (1860-08-01), Barnard
patent: 253508 (1882-02-01), Cheney
patent: 1520047 (1924-09-01), Browr
patent: 2102413 (1934-04-01), Hall
patent: 3133359 (1961-06-01), Kuriyama
Nystrom '65, Catalog #C-65, p. 41, 1965.

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