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        3-12

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        Part of The Bridgeman Art Library
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        The Figure of the Cross-Staff, illustration from 'A New Systeme of the Mathematicks' by Jonas Moore, published 1681

        English School, (17th century). Medium: engraving. Date: 1681. Jonas Moore (1617?1679). A Cross-Staff was used in navigation to determine angles. Provenance: Private Collection.

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