Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 415
d spaced from 1 toly apart. Water-line from 10 to 15above crown-sheet. There is supposed to be a propor-tion between the tube sectional areaand the grate-surface, say from \ inthe horizontal to ^ in the verti-cal ; but this rule is entirely em-pirical. There is also a propor-tion of grate to…
Mechanical drawing
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