Visual teaching device

Details Visual teaching device Visual teaching device

1979-04-30

1980-09-16

Skogquist, Harland S.

Undertaking

35 49, 272 8N, G09B 2700

Patent

active

042221803

ABSTRACT:
Disclosed herein is a device conformed as a cylindrical structure having a bore axially bending partly therethrough, the end surface around the bore being coated with a phosphorescent coating and the bore surfaces being coated with black paint. By virtue of these coatings and the relative reflection coefficient thereof, a substantially true visual impression is created duplicating the appearance of a black hole in space. Thus the device may be used as a teaching aid assisting the user in the visualization of a complex physical phenomenon.

REFERENCES:
patent: 1727483 (1929-10-01), Moszelt
patent: 4073529 (1978-02-01), Ostrin
patent: 4123591 (1978-10-01), Karki

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