Projection apparatus for planetariums

Details Projection apparatus for planetariums Projection apparatus for planetariums

1992-01-23

1993-03-16

Wilson, John J.

Education and demonstration

Science

Astronomy

G09B 2700

Patent

active

051940094

ABSTRACT:
Projection devices (2, . . . ,9) for representing the orbital curves of planets are fitted in several planes beneath the main instrument (1) for fixed star projection. The projection devices (2, . . . , 9) can be moved, respectively independently of each other, around a common vertical axis (14). They include, in addition to the projection units proper, deflecting mirrors which are rotatable relative to the projection units. The spacings of the deflecting mirrors from the common vertical axis of rotation (14) increase in the direction from above to below the apparatus.

REFERENCES:
patent: 2168799 (1939-08-01), Korkosz et al.
patent: 2748652 (1956-06-01), Bauersfeld et al.
patent: 3074183 (1963-01-01), Frank
patent: 3552037 (1971-01-01), Stern
patent: 3589035 (1971-06-01), Vickery
patent: 3596379 (1971-08-01), Faulkner
patent: 3707786 (1973-01-01), Clark
patent: 4643681 (1987-02-01), Suzuki et al.

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