Drawings for the 'Heron' air pump for four-wheel brakes, noting a necessary modification to the springs.
| Identifier | Morton\M22\ img224 | |
| Date | 19th October 1922 | |
| TO EX FROM HS {Lord Ernest Hives - Chair} c. to CJ. RECEIVED OCT 1922 ORIGINAL E1/M19.10.22. "HERON(Experimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo)" - AIR PUMP FOR FOUR WHEEL BRAKES. X3850 X4550 We send you herewith drawings Nos. Lec 1641 & 1643 shewing respectively air pump and control valve springs, and air pump cam. The springs given on Lec 1641 differ slightly from those drawn on Lec 1626 & 1639, as the final calculations shewed that some modification was necessary. Would you kindly issue the necessary instructions? 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).