| Year | 1981 |
| Date | 17-Jul |
| Volume | 147 |
| Issue | 3,661 |
| Page | 886 |
| Category | Steam |
| Part | |
| Title | A Case for Balanced Slide Valves |
| Author | Bill Van Brocklin, Jr. |
| Notes | Massachusetts, U.S.A. The balanced slide valve on Bill Van Brocklin's American 4-4-2, the authors 3 1/2"g. Tilbury tank |