Education and demonstration – Geography – Terrestrial globe or accessory therefor
Patent
1988-10-06
1990-07-03
Coven, Edward M.
Education and demonstration
Geography
Terrestrial globe or accessory therefor
368 23, 434136, 434142, G09B 2708
Patent
active
049386956
ABSTRACT:
A device for controlling the direction of rotation of a world globe. The device has a ratchet ring which is affixed to the globe near the North or South Pole thereof. A deflectable pawl member is held by the support frame of the globe and permits the globe to rotate only so that its surface moves eastwardly.
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patent: 3997980 (1976-12-01), Rogers
"Mechanisms, Linkages and Mechanical Controls".COPYRGT., 1965, Nicholas Chironis, Ed., pp. 148-149.
Averill, Jr. Edgar W.
Coven Edward M.
Szczepanik V.
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