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009359

David Rittenhouse (1732-1796), American astronomer and inventor. He introduced spider's web as cross-hairs in telescopes and measuring instruments. He discovered the atmosphere of the planet Venus. Engraving 1896.

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009359.jpg
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Irish Photo Archive
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David Rittenhouse (1732-1796), American astronomer and inventor.  He introduced spider's web as cross-hairs in telescopes and measuring instruments.  He discovered the atmosphere of the planet Venus. Engraving 1896.