| Year | 1955 |
| Date | 07-Jul |
| Volume | 113 |
| Issue | 2,824 |
| Page | 21 |
| Category | Pump |
| Part | |
| Title | Rotary Pumps and Motors. A Practical Review of Their Design and Construction |
| Author | "Artificer" |
| Notes | Positive Displacement Pumps, Gearwheel Type. Operation, by the Crown Engineering Co., principle of the gearwheel pump, the Hamworthy "Y" series, Rotherham pump, Feuerheerd patent, Slack & Parr, the Roots blower, variants of the gearwheel pump |