| Description | Mis-dated by Boulton as 1781.Docketed “The revolving motion. "Summarised “Valuable information re. sun and planet motion, with Boulton’s sketch [within the text]. Boulton calculates the dimensions of a fly wheel. Concerning the crank and tube condenser. Watt’s discovery of acid of galls and sugar, and other remarks. Re. Mr. Keir.” |