Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 137
ele-vation illustrating this idea. The ends of some of thebricks should be allowed to project at intervals from th( 123 124 Steam Engineering outer walls across the air space^ so as to come in touch withthe inner walls. Where boilers are set in batteries of two or moie, themiddle or party walls…