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).
Letter to ED. Jaeger (London) Ltd. with specifications for speedometer instruments and flexible drives.
| Identifier | ExFiles\Box 165\4\ img016 | |
| Date | 12th March 1928 | |
| X4665 Expl: Dept: Hs{Lord Ernest Hives - Chair}2/LG. 12th. Mar. 1928. Messrs. ED.{J. L. Edwards} Jaeger (London) Ltd., St.{Capt. P. R. Strong} Leonards Ad., Willesden Junction, London N.W.10. Dear Sirs, With reference to your HRB/DAW of the 9th.inst. The following are the particulars you require. We should like an instrument suitable for a 16 X 52 axle, with a flexible drive 5 ft. long. Attached are drgs. of the gearbox end of the flexible drive as at present used - G.50050 and F.77619. A Smith wiper will be fitted with these instruments. Speedometer Revs. .3511 of propeller shaft revs. At 600 speedometer revs/min. car speeds are :- 17 X 52 axle ratio 33 m.p.h. 16 X 52 " " 31 m.p.h. 15 X 52 " " 29.3 m.p.h. Road wheel revs/mile with present standard tyres 33 X 3.75 at 35 lbs/sq.in. pressure 625. Yours faithfully, | ||