Letter with a sketch, discussing points of criticism for a dynamo design, referencing drawing B.254.
| Identifier | ExFiles\Box 180\M6\ img047 | |
| Date | 10th March 1928 | |
| Le Chuadel Saturday afternoon. 10/3/28 Dear Mr Bentley, Many thanks for sending me your long & very interesting letter, the blue of the dynamo design and the proofs of the drawings on the chassis boiler. they are all good & what's more. I wired you about the dynamo design (Jullien) Drawing B.254, as a design it is seen to be an improvement on past work, but there are certain points that I cannot understand. my criticism follows. (1) Why use ball & roller bearing, because they do not seem cleverer or cheaper & the lubrication entails the fill & the only advantage seems to be that of a shorter overall length + (2) I can understand the new tail-end is dust-proof & so that if it is left to us to decide we must I first learn the usual practice & then improve upon it if we know how & at some one's cost. + (3) Sapphire ball bearings are specified and we must supply them, there is some necessity that we purchase them easily from the dynamo Spindles or get them in a bearing that can be left behind when the end covers are removed. It is assumed that the end cover pulls off longitudinally like the yoke. + (4) I was a little surprised that you are now using an inclined machine, because one thinks that a dynamo built on a bed was more open and accessible. PTO | ||
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).