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).
Letter regarding the submission of two sets of 'Prima' sparking plugs for testing.
| Identifier | ExFiles\Box 33\3\ Scan185 | |
| Date | 29th October 1921 | |
| Experimental Dept. Dear sirs, You will no doubt have received from Folkestone a small parcel containing a further set of 6. Prima sparking plugs with a gap of 0.75 m/m for battery ignition. I shall feel obliged if you will test these. Perhaps I may be shortly receiving your report concerning the first set of plugs sent to you with a 1/2 millimetre gap? R.S.V.P. Yours truly George Roberts c/o Peek Frean & Co Ld. London | ||