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).
Instructions for testing a coil with 1/3 less iron in its core and a 50% longer ballast.
| Identifier | ExFiles\Box 69\1\ scan0066 | |
| Date | 20th October 1927 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 X.8710 ROLLS-ROYCE LTD. INSTRUCTIONS. To E7C. Order No. Customer's No. X.8710 Date 20-10-1927 Herewith the coil West brought along to me the other day. You will remember that this coil has 1/3 less iron in its core than standard. Otherwise it is the same as the other S.P. coils you are testing. I suggest you try this coil with a ballast 50% longer than standard as has been done. This & it appears quite OK & of course takes less current. I am interested to know how this coil behaves on your test. Perhaps you will let me know. Signed E J Brock This Sheet must be filed on completion of the work. | ||