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).
Directive to recalibrate speedometers for the 20 HP chassis due to the use of larger diameter tyres.
| Identifier | ExFiles\Box 50\4\ Scan312 | |
| Date | 17th October 1929 | |
| ROY. {Sir Henry Royce} c. BY {R.W. Bailey - Chief Engineer} /HBB. c. BY {R.W. Bailey - Chief Engineer} /TWD. {T. W. D???Aeith} c. EFC. {E. Fowler Clarke - Electrical Engineer} X4308 BY {R.W. Bailey - Chief Engineer} /Cgh {W Clough} 14/G.17.10.29. 20 HP. CHASSIS - SPEEDOMETERS. -------------------------- Owing to the fact that the Dunlop silent tread tyres are somewhat larger in diameter than the Buttressed tread type, and that other makes of tyres which some customers insist on having fitted are still larger in diameter, it has now been decided, similar to what we did for the 40/50 HP. chassis, that the speedometers should be calibrated for a speed of 720 revs. per mile instead of 740, therefore will you please arrange for this alteration to be brought into effect as soon as possible forpresent production 20 HP. chassis. BY {R.W. Bailey - Chief Engineer} /Cgh. {W Clough} | ||