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).
To Mr. Clark regarding the submission of 8 'B type' coils for testing.
| Identifier | ExFiles\Box 45\4\ Scan013 | |
| Date | 30th March 1922 | |
| X.4079.a 30.3.22. Mr. Clark. Please accept 8 B type coils for testing to the following No. S.B.5 S.B. 7 X.B.9 S.B.6 S.H. 8 S.B.10 S.B.11 S.B.12 and oblige. 'Sgd' W. Gamble. | ||