| Year | 1912 |
| Date | 12-Dec |
| Volume | 27 |
| Issue | 607 |
| Page | 555 |
| Category | Lessons from the Laboratory |
| Part | |
| Title | Boring a Long Hole |
| Author | |
| Notes | Showing general arrangement of testing apparatus, showing reflections in a tube bore, showing lines of reflection crossing & separating in the case of slightly bent barrels |