1. Essays, mathematical and physical : containing new theories and illustrations of some very important and difficult subjects of the sciences. Never before published. Title: Essays, mathematical and physical : containing new theories and illustrations of some very important and difficult subjects of the sciences. Never before published. Date: [1802] Author: Mansfield, Jared, 1759-1830. Collecting Area: Rare Books Call number: QA 7 M28 1802 LOCAL