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).
Modification of Phantom III sparking plugs, increasing the screwed portion length.
| Identifier | ExFiles\Box 162\6\ img299 | |
| Date | 7th November 1935 | |
| DV C. Hs{Lord Ernest Hives - Chair}/Em. RHG. C. Hs{Lord Ernest Hives - Chair}/Wst. 36-002 E/JNR.{Charles L. Jenner}3/HP.7.11.35. re Phantom 3 Sparking Plugs. Ref.Hs{Lord Ernest Hives - Chair}/Wst.3/MA.16.10.35. We are informed by Hs{Lord Ernest Hives - Chair}/Wst. that Messrs. Lodge are increasing the length of the screwed portion of their sparking plugs for the purpose of brazing in the electrodes. We have prepared a drawing - LeC.4797, which we send you herewith, shewing the inserts in the cylinder suitably increased on the inside so that this new sparking plug will not project beyond the end of the insert. E/JNR.{Charles L. Jenner} | ||