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Collins, John, 1625-1683.
The sector on a quadrant, or A treatise con- taining the description and use of four several quadrants; two small ones and two great ones, each rendred many wayes, both general and parti- cular. Each of them accomodated for dyalling; for the resolving of all proportions instrumentally; and for the ready finding the hour and azimuth universally in the equal limbe. Of great use to seamen and practitioners in the mathematicks.
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