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词汇 Eidouranion
分类 英语词汇 英语翻译词典
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Eidouranion

英语百科

Eidouranion

Proscenium of the English Opera House, Strand, 21 March 1817, with Walker's exhibition of the Eidouranion.

An Eidouranion is a kind of orrery that combined mechanical movement with a method of back projection. Its invention is attributed to Adam Walker who in the 1780s built one measuring 27 feet in diameter. He used it to accompany his lectures on astronomy. It is an ancestor of planetarium projectors.

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