A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
J. Wallis. "A Discourse concerning the Methods of Approximation in the Extraction of Surd Roots. By John Wallis, S. T. D. and Savilian Professor of Geometry at Oxford." Philosophical Transactions of the Royal Society of London 19.215-235 (1695) 2-11