The art of measuring made easy by the help of a new sliding-rule : Which performs the same at one operation, as requires two, or three, or more on the sliding-rules heretofore used, in a plain, easy, and concise method, entirely new. By W. Bradford, R. Darby, and J. Hulls, Philomath. - Bradford, William (Printed by S. Brooks, in Broad-Gate, 1754)