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).
The satisfactory condition of Watford Aero Magnetos type I.S.12 following a 120-hour test.
| Identifier | ExFiles\Box 43\4\ Scan148 | |
| Date | 1st February 1929 | |
| X4021 To R: from EFC. c. to Sg.{Arthur F. Sidgreaves - MD} Mor. c. to E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} EFC1/LG25. 2. 29. ---------------- WATFORD AERO MAGNETOS - TYPE I.S.12. ------------------------------------ Further to our EFC3/T10.9.28 and Hs{Lord Ernest Hives - Chair}/VH1/LG25.2.29 these magnetos have been examined in our laboratory subsequent to the 120 hrs. test and found to be in entirely satisfactory condition, the wear of the contact points being negligible. It will be remembered that in the earlier I.S.12 machines there was difficulty due to the rapid wear of the contact points as a result of the ingress of oil vapour. EFC. | ||