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About Foucault Pendulums - $30 (Los Angeles)

"ABOUT FOUCAULT PENDULUMS and How They Prove the Earth ROTATES", . A SCRIPTOGRAPHIC STUDY UNIT. CHANNING BETE CO. 1968 Edition. Large format softcover booklet, 14 pages. Using lots of illustrations, gives good simple explanations of how Pendulums work. Rare publication.

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