| Year | 1929 |
| Date | 15-Aug |
| Volume | 61 |
| Issue | 1,475 |
| Page | 158 |
| Category | Internal Combustion |
| Part | |
| Title | The Model I.C. Engine - Fuels and Efficiency |
| Author | Andrew Gillespie |
| Notes | Light spring indicator diagram, efficiency curves, alcohol as fuel, showing effect on diagram of increasing the compression ration |