| Year | 1927 |
| Date | 01-Sep |
| Volume | 57 |
| Issue | 1,373 |
| Page | 195 |
| Category | Workshop |
| Part | |
| Title | A Model Valveless Pneumatic Hammer |
| Author | J.R.N. |
| Notes | Principle of the valveless pneumatic hammer, diagram showing system of working, view, details, main frame, the hammer, base, the pressure container |