Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 541
ypositions 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 inch-pipeinside the valve with the upper water-space of the boiler. Figs. 1252,1253, and 1254 are draw-ings of boiler… … Fig. 1251. ENGINEERING DRAWING. 525
Mechanical drawing
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