A treatise of gnomonicks / written in French by Mr. Ozanam, Professor of the Mathematicks at Paris, done into English, and amended in several places, by J. T. Désaguliers of Hart-Hall, Oxon, with an addendum consisting of Jacques Ozanam's Problems of Dialling extracted from the 1708 English edition of his Recreations mathematical and physical. Compiler and editor: Frederick W. Sawyer III.