Drawing of a 3 1/2 Litre S.S. water pump impellor.
| Identifier | ExFiles\Box 126\5\ scan0149 | |
| Date | 8th March 1938 guessed | |
| 3 1/2 LITRE S.S. WATER PUMP IMPELLOR. S.S.37 .375 DIA .075 .050 .750 2.737 DIA .359 .225 .96875 1.650 1.100 .950 .691 DIA .800 130° .812 R. {Sir Henry Royce} 1.150 .59375 | ||
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).