Forming a Complete Course of Mechanical, Engineering, and Architectural Drawing. From the French of M. Armengaud the elder, Professor of Design in Conservatoire of Arts and Industry, Paris, and MM. Armengaud the younger, and Amoroux, Civil Engineers. Rewritten and arranged with additional matter and plates, selections from and examples of the most useful and generally employed mechanism of the day. By William Johnson, Assoc. Inst. C. E. Illustrated by fifty folio steel plates, and fifty wood cuts. A new edition, 4to....$10 Among the contents are: Linear Drawing, Definitions, and Problems. Sweeps, Sections, and Mouldings, Elementary Gothic Forms, and Rosettes. Ovals, Ellipses, Parabolas, and Volutes. Rules and Principal Data. Study of Projections. Elementary Principles. Of Prisms and other Solids. Rules and Practical Data. On coloring Sections, with applications. Conventional Colors, Composition or Mixture of Colors. Continuation of the Study of Projection--Use of Sections--details of machinery. Simple applications--spindles, shafts, couplings, wooden patterns. Method of constructing a wooden model or pattern of a coupling. Elementary applications. Rules and Practical Data. THE INTERSECTION AND DEVELOPMENT OF SURFACES, WITH APPLICATIONS.--The Intersection of Cylinders and Cones. The Delineation and Development of Helices, Screws, and Serpentines. Application of the helix--the construction of a staircase. The Intersection of Surfaces--applications to stop cocks. Rules and Practical Data. THE STUDY AND CONSTRUCTION OF TOOTHED GEAR.--Involute, cycloid, and epicycloid. Involute, Cycloid. External epicycloid, described by a circle rolling about a fixed circle inside of it. Internal epicycloid. Delineation of a rack and pinion in gear. Gearing of a worm with a worm wheel. Cylindrical or Spur Gearing. Practical delineation of a couple of Spur wheels. The Delineation and Construction of Wooden Patterns for Toothed Wheels. Rules and Practical Data. CONTINUATION OF THE STUDY OF TOOTHED GEAR.--Design for a pair of bevel wheels in gear. Construction of wooden patterns for a pair of bevel wheels. Involute and Helical Teeth. Contrivances for obtaining differential Movements. Rules and Practical Data. ELEMENTARY PRINCIPLES OF SHADOWS.--Shadows of Prisms, Pyramids, and Cylinders. Principles of Shading. Continuation of the Study of Shadows. Tuscan Order. Rules and practical data. APPLICATION OF SHADOWS TO TOOTHED GEAR.--Application of Shadows to Screws. Application of Shadow to a Boiler and its Furnace. Shading in Black--Shading in Colors. THE CUTTING AND SHAPING OF MASONRY.--Rules and Practical Data. Remarks on Machine Tools.