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).
Standardisation of a battery ignition contact breaker to improve the performance and life of tungsten points.
| Identifier | ExFiles\Box 172\3\ img106 | |
| Date | 14th November 1927 | |
| RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1157. ORIGINAL COMPLETED 22.12.27 STANDARDISATION of CHASSIS PARTS. Date 14.11.27 No. 8692 Drawing No. Part List Description of Parts. Battery ignition contact breaker to Lec.2460 permitting scrubbing action between the tungsten points and new design of spring for reduced maximum stress. Origin. To improve performance and life of tungsten points by improving the running condition of working surfaces. Experimental Test Report. This particular design involved only a comparatively small modification to existing std. parts. A 10,000 miles test has been made on the bench with a result which is at least as satisfactory as any test on RR. ignition which we have so far made. These are being placed on the expl. cars and one will shortly run a 10,000 miles test in France. Road Test Report. We recommend that no more of the present contact breakers should be instructed. We ought to adopt this improvement as soon as possible. A 10,000 miles test will be completed before any cars are delivered. Weight of Old Part. Cost of Old Part. £ 10s. 6d. Weight of New Part. Cost of New Part. 10s. 6d. Wor.{Arthur Wormald - General Works Manager} Difference per Car. No difference. Difference per Car. Nil. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Signature from Cost Dept. that above is correct. G/Rd. 9.12.27 [Action Box] D.{John DeLooze - Company Secretary} Use existing stock Alteration effective on future Chassis. Cost of Parts in Works which will be scrapped if commenced on:- Series........£........ Series........£........ Series........£........ INITIAL | DATE | REMARKS BJ. | 22.12.27 | Agreed. B.J. R.{Sir Henry Royce} | 21/11/27 | Agreed. LNR WOR.{Arthur Wormald - General Works Manager} | 16.11.27 | Agreed. Wor.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} | 22.11.27 | Agreed. RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 19.11.27 | Agreed. Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 21.11.27 | Agreed. BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 16.11.27 | Agreed. EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 21/11/27 | Agreed E.{Mr Elliott - Chief Engineer} Different degrees of scrubbing should be tested on the bench by varying the truth of the mounting of the stationary contact. PN.{Mr Northey} | 29.11.27 | Agreed. PN.{Mr Northey} CWB. | 15.11.27 | Agreed. CWB. HS.{Lord Ernest Hives - Chair} | 14.11.27 | Agreed. Hs.{Lord Ernest Hives - Chair} | ||