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).
Dalby-Watson Optical Indicator and the availability of a specially ordered arc lamp.
| Identifier | ExFiles\Box 79\3\ scan0053 | |
| Date | 3rd October 1917 | |
| To EFC. from R.{Sir Henry Royce} c. to EH. c. to By c. to BJ. EF St.{Capt. P. R. Strong} Margaret's Bay Oct. 3rd. 1917. RE DALBY-WATSON OPTICAL INDICATOR X.3181. R5/W31017. With reference to your EFC3/T27917, regarding above, it would be a great advantage to indicate our engines, go ahead- we have an arc lamp specially ordered in stock. R.{Sir Henry Royce} R.R. 235B (200 T) (S.D. 408. 26-4-17.) Bm. 2/156/12. | ||