| Year | 1925 |
| Date | 21-May |
| Volume | 52 |
| Issue | 1,256 |
| Page | 563 |
| Category | Pump |
| Part | 4 |
| Title | Some Unusual Pumping Appliances and Some Model-Making Suggestions |
| Author | Bertram Joy |
| Notes | Gas Pumps. One essential feature of the Humphrey direct explosion pump, mode of operation, valve chamber and igniting device of the writer's early pump, proposed model gas pump, base, valve grid, gas valve head, ignition timing diaphragm |