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).
From EFC to Roy requesting an order for four dry cells for test equipment.
| Identifier | ExFiles\Box 63\1\ scan0221 | |
| Date | 5th September 1930 | |
| X3030 Roy.{Sir Henry Royce} from EFC. EFC1/AD5.9.30. Will you please order 4 dry cells Ediswan type E.R.2. two of these being required for operating our P.O. resistance measuring box and two being required for the whipple pyrometer box. The reason these are required is that the cells which have been in use are now badly down require replacing. EFC. | ||