Accompanying drawing Lec.1639, detailing an automatic air pump cut-out device for the 'Heron' model's four-wheel brakes.
| Identifier | ExFiles\Box 183\M22\ img215 | |
| Date | 12th October 1922 | |
| AUTO PNEU. CUTOUT FWB HERON(Experimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo) To BY. {R.W. Bailey - Chief Engineer} from E. {Mr Elliott - Chief Engineer} c. to CJ. Hs. {Lord Ernest Hives - Chair} E2/M12.10.22. AIR PUMP CONTROL DEVICE FOR FOUR WHEEL BRAKES ON "HERON(Experimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo)". X.3836 X.3850 X.4550. We send you herewith drawing No.Lec.1639 shewing the automatic device for cutting out the air pump on the "Heron(Experimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo)" and alterations to the crankcase. There are one or two modifications to Lec.1626 shewn on this drawing. E. {Mr Elliott - Chief Engineer} | ||
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).