An appendix to the Elements of Euclid, [electronic resource] : in seven books. Containing forty-two moveable schemes for forming the various kinds of solids, and their sections, by which the Doctrine of Solids in the Eleventh, Twelfth, and Fifteenth Books of Euclid is illustrated, and rendered more easy to Learners than heretofore. Book I. Contains the Five regular Solids. II. Shews the Inscription and Circumscription thereof, as set forth in the Fifteenth Book of the Elements. III. Exhibits a great Variety of irregular Solids. IV. Contains sundry Sorts of Prisms. V. Various Kinds of Pyramids, and Frustrums thereof. VI. Some difficult Propositions in the Eleventh and Twelfth Books. Vii. The Cone and its several Sections. Second edition. By John Lodge Cowley, F. R. S. Professor of Mathematicks in the Royal Academy at Woolwich.