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 138
and 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. Bach Arches, A good and durable arch can be madefor the back connection, extending from the back wall to… … Fig. 49
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