Manually indexed adjustable focal length planetarium

Details Manually indexed adjustable focal length planetarium Manually indexed adjustable focal length planetarium

1984-10-31

1986-04-01

Grieb, William H.

Education and demonstration

Science

Astronomy

G09B 2700

Patent

active

045795347

ABSTRACT:
A dome surface includes patterned perforations which allow light passing through to form various star constellations on a separate external surface. The dome rests upon a base which houses both a light source and a lens system, which may be adjustable, to control the spread of light. The base also has a compass attached to it for the purpose of orienting the planetarium to the actual direction of "true North." A tap player might also be attached to the base of offer recorded instructions. Above the dome there can be placed an opaque mask which blocks the light coming through most of the dome perforations while allowing light to be projected only through one or several sets of perforations which represent selected star constellations. A support placed under one side of the planetarium base tilts the planetarium to an angle corresponding to the local latitude.

REFERENCES:
patent: 1126231 (1915-01-01), Kullmer
patent: 2693130 (1954-11-01), Green
patent: 2763183 (1956-09-01), Liversidge
patent: 3596379 (1971-08-01), Faulkner

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