Drawing Lec 1639 for an air pump control device on the 'Heron'.
| Identifier | ExFiles\Box 183\M22\ img216 | |
| Date | 12th October 1922 | |
| To. By. {R.W. Bailey - Chief Engineer} from E. {Mr Elliott - Chief Engineer} c. to CJ. Hs. {Lord Ernest Hives - Chair} ORIGINAL RECEIVED 4 S 1922 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)". X3836 Y3850 X4550 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 shown 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).