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).
Confirming the successful testing of 25 Exide type S1 hydrometers.
| Identifier | ExFiles\Box 44\5\ Scan101 | |
| Date | 14th February 1928 | |
| To EY/Mtn. from EFC. c. Central Stores. V3741 EFC3/T14.2.28. We have tested the 25 Exide type S1 hydrometers which were recently handed to us, and find these all to be O.K. We now return these to the Stores. EFC. | ||