From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance comparison table for 'The Cyclone Foot Pump' using a Pump gauge and a Schrader gauge.
| Identifier | ExFiles\Box 149\5\ scan0036 | |
| Date | 2nd October 1922 | |
| Mr. Hives from GWH.{George W. Hancock - Head Chateauroux} X993 2.10.22. THE CYCLONE FOOT PUMP. Mins. | Pump gauge. | Schrader gauge. --- | --- | --- 3 | 10 | --- 5 | 30 | 25 slightly under 7 | 40 | 35 " over 8 | 45 | 40 O.K. 9 | 50 | 45 O.K. 10 | 55 | 50 slightly over 11 | 60 | 55 " " 12 | 65 | 60 O.K. 13 | 70 | 65 slightly under 14 | 75 | 70 " " 15 | 75 | 75 " " 16 | 75 | 75 O.K. 17 | 80 | 75 slightly over. 18 | 80 | 80 O.K. | ||