| Year | 1989 |
| Date | 01-Dec |
| Volume | 163 |
| Issue | 3,862 |
| Page | 726 |
| Category | Steam |
| Part | 2 |
| Title | Safety Valves. Recent discussions reviewed plus some final comments by Laurie |
| Author | Tubal Cain |
| Notes | To sum up, an addendum, in reply Laurie comments. See EIM 25 6 179 |