| Year | 1926 |
| Date | 01-Jul |
| Volume | 55 |
| Issue | 1,312 |
| Page | 7 |
| Category | Workshop Topics |
| Part | |
| Title | Building a 1/2-h.p. "Hartop" Gas Engine |
| Author | T.W.Averill |
| Notes | Fitted with governor and cam-controlled mixing valve, rear elevation, section side elevation, crankshaft, oiler ring |