Confirming telephoned instructions to the Iron Foundry regarding the production of cast iron rings for brake drums.
| Identifier | ExFiles\Box 110\1\ scan0063 | |
| Date | 22th September 1941 | |
| To: Mr.Knagg, Iron Foundry. c. Mr.Wheeler. Mr. Peak. Rm {William Robotham - Chief Engineer} /MHR. {M. H. Rigby} 2/RH. {R. Hollingworth} 22.9.41. 706. This is to confirm that the original 12 cast iron rings RG. {Mr Rowledge} 2599 for use with the wider type of alum. brake drum RG. {Mr Rowledge} 2598, produced to an instruction Rm {William Robotham - Chief Engineer} /MHR. {M. H. Rigby} 10/JH.17.7.41 were all porous in the middle; the porosity only showed up after machining away a large proportion of the casting. The latest ring, however, which was machined from a thinner casting, showed a 100% X-Ray and is also very good after machining. We therefore confirm our telephoned instructions for you to make three more rings in the same way before altering the pattern. Rm {William Robotham - Chief Engineer} /MHR. {M. H. Rigby} | ||
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).