Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 541
front.below, different from that given in Fig. 918,where the lower part of the shell projects beyond the head of the boiler, andthe cast-iron front covers the end. The doors giving access to the tubes areusually semicircular, and hung on the top diameter, but it will be found moreconvenient to form… … In the figure the man-hole frame isriveted to the inside of the boiler; fre-quently it is on the outside. In manypositions the man - hole should beplaced in the back-head, as easier ofaccess. With the blow-off in the flue(Fig. 1249) it is well to make it a circu-lating pipe by connecting an…
Mechanical drawing
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