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).
The testing of syringe hydrometers, noting they are an earlier type.
| Identifier | ExFiles\Box 44\5\ Scan093 | |
| Date | 29th June 1927 | |
| EFC. X3791. 29.6.27. 1 doz. syringe hydrometers received for test were all found to read correctly when checked with the standard Twaddell hydrometers. These hydrometers were of the earlier type, and not as I last tested and passed as being an improvement on the previous type then being issued for production. EFC/G.Johnson. | ||