| Year | 1939 |
| Date | 09-Nov |
| Volume | 81 |
| Issue | 2,009 |
| Page | 531 |
| Category | Pump |
| Part | |
| Title | Small Centrifugal Pumps |
| Author | "Artificer" |
| Notes | Design, construction and application. A medium-sized "general service" pump, the "Wall" four-cylinder engine showing circulating pump, general arrangement, coupled to "Batwin" motor, essential conditions in pump design |