(SQUARE INCHES.)
----------+-----------------------------------------
Height | DIAMETER OF BOILER IN INCHES.
from tubes+-----+-----+-----+-----+-----+-----+-----
to shell.| 36 | 42 | 48 | 54 | 60 | 66 | 72
----------+-----+-----+-----+-----+-----+-----+-----
15 | 389 | | | | | |
16 | 419 | | | | | |
17 | 458 | 526 | | | | |
18 | | 566 | 620 | 667 | | |
19 | | 608 | 667 | 720 | | |
20 | | 650 | 714 | 770 | 824 | |
21 | | | 756 | 824 | 882 | |
22 | | | 808 | 878 | 937 | |
23 | | | | 930 | 996 |1059 |
24 | | | | 982 |1056 |1121 |
25 | | | |1037 |1116 |1184 |
26 | | | |1090 |1209 |1252 |1324
27 | | | |1145 |1234 |1316 |1394
28 | | | | |1291 |1381 |1465
29 | | | | |1352 |1445 |1536
30 | | | | |1414 |1511 |1608
31 | | | | | |1576 |1674
32 | | | | | |1641 |1746
33 | | | | | | |1818
34 | | | | | | |1896
----------+-----+-----+-----+-----+-----+-----+-----