Book excerpt: The newly designed Sheet Metal Pocket Manual is a reference book dealing with tables, problems and solutions, and practical on-the-job methods: designed for use by the journeyman while in the field or in the shop; made to be carried in the tool box or in the pocket as a practical data book in general sheet metal work. Specific contents cover perimeters, circumferences, areas, volumes, transitions, offsets, allowances, ducts, gutters, belts and pulleys, screws, rivets, welding rods, welding tips, soldering fluxes, galvanic activity, thermal expansion, sheet metal terms, knots, sheaves, weights, functions of numbers, tap and drill sizes, and masonry fasteners.