Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 138
soot canthen be easily cleaned out by means of a long-handled hoeor scraper inserted through the cleaning out door, whichshould always be placed in the back wall of every boiler set-ting. Back Arches. A good and durable arch can be madefor the back connection, extending from the back wall to Boiler… … L<? Fig. 49
