| Year | 1919 |
| Date | 11-Sep |
| Volume | 41 |
| Issue | 959 |
| Page | 252 |
| Category | Internal Combustion |
| Part | 11 |
| Title | A Quick Revolution High-Power Gas Engine |
| Author | F.Hall Bramley |
| Notes | The Contact Maker. The pattern, machining the casting, the pillars, the contact pillar, the blade, the cam, details of construction of contact maker |