(a) An elbow for 12" pipe?
(b) An elbow for 14" pipe?
(c) An elbow for 18" pipe?
(d) An elbow for 24" pipe?
Problem 13M.—The "small end cut" of an elbow, or pipe, is always found by deducting seven times the thickness of the metal used from the cut of the big end. What would be the "small end cut" of the elbows in Problem 13L, if No. 20 U.S.S. Gage steel was used? Number 20 gage is .037".
Problem 13N.—Fill in the columns in the table of deductions given below. The figures for the third column are obtained by multiplying those of the second column by 7. The figures for the fourth column are obtained by dividing those of the third column by .0156. This will give answers in 64ths of an inch since .0156 is the decimal for .
Example of columns filled in:
| Gage | Decimal Thickness | Decimal Deduction | Fractional Deduction |
| No. 23 | .028125" | .196875" |
" (nearly) |
Table of Deductions for Small End Cuts
| U.S.S. Gage | Decimal Equivalent, Thickness in Inches. |
Decimal Deduction, Thickness×7 |
Fractional Deduction, Decimal Deduction÷.0156 |
| No. | |||
| 28 | .015625 | ||
| 26 | .01875 | ||
| 24 | .025 | ||
| 22 | .03125 | ||
| 20 | .037 | ||
| 18 | .05 | ||
| 16 | .0625 | ||
| 14 | .078125 | ||
| 12 | .109375 |
