FORTHCOMING WORKS BY DR. BOLI.

Pipes, Valves, and Fittings: A Pageant for Elementary-Age Children. At once entertaining and educational, this pageant presents the properties of fluids, the methods and procedures of welding, the equations governing flange design, calculations of longitudinal stress, &c., in a manner that fires the young imagination. A prominent feature is the Nitrided Steel Song which was such a success at the Young People’s Metallurgical Congress in Weirton last July. Includes a detailed easy-to-sew pattern for the Boyle’s Law costume, along with a number of practical blocking suggestions which will be found useful by amateur directors. Sold in packs of ten copies plus Director’s Edition bound in vellum.