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).
Recommendation for S.S. and India 1V speedometer cable revolutions per mile standards.
| Identifier | ExFiles\Box 15\5\ Scan086 | |
| Date | 4th July 1929 | |
| x 4310. To Ev.{Ivan Evernden - coachwork}from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}/Jl.4.7.299 Copy to Mx.{John H Maddocks - Chief Proving Officer} EFC. X4308 X5310, S.S. and India 1V Speedometers. In view of the fact that S.S.owners may fit 20" rims with the smaller tyres to their cars, and 20 HP.owners 19" rims. We recommend that the S.S.Speedometer standard should be 775 cable revs.per mile and the 20 HP gakke [strikethrough]gauge[/strikethrough] 720 cable revs.per mile. This will ensure that the speedometers do not read slow under any conditions. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||