The sector of a quadrant : or a treatise containing the description and use of four several quadrants ... / written by John Collins. - Collins, John, 1625-1683 (printe by J. Macock; to be sold by George Hurlock Book-seller at Magnus Corner, by William Fisher at the Postern near Tower Hill, and by Henry Sutton Mathematical Instrument Maker, at his House in Thredneedle street behind the Exchange, 1658)