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 dynamo brushes, proposing a Morganite EG2 grade as an alternative to Le Carbone grade.
| Identifier | ExFiles\Box 60\1\ Scan116 | |
| Date | 14th March 1929 | |
| RR 755 REVISED (10H) (D.C. 777-29-2-28) MS C. LTD X8673 Completed 9/7/29. STANDARDISATION of CHASSIS PARTS. Date 14.3.29 Description of Parts. MORGANITE EG2 GRADE BRUSHES FOR 40/50 & 'S.S.' DYNAMOS (as an alternative to present standard Grade Le Carbone brushes). Origin. Desirability of second source of supply - particularly a British source. X No. 8673 7670 Drawing No. Part List A Scrap and replace at all costs, including Chassis already delivered to Customers. B Scrap and replace on Chassis in Works. C Scrap present stock and replace on all Chassis not yet handed to test. D Use existing stock Alteration effective on future Chassis. Experimental Test Report. Morganite EG2 material is the nearest equivalent of LeCarbone grade Z., being hard graphitic and having a specific resistance of .0012 ohm. per inch cube. It has been carefully proved on the new 28 slot armatures that these brushes are equally good with standard. See report EFCl/T7.2.29. Road Test Report. [Stamp: J.S.] [Stamp: RECEIVED, with clock face and year 1929] Weight of Old Part. Cost of Old Part. £0 - 4 - 5 Weight of New Part. Cost of New Part. £0 - 4 - 5½ Difference per Car. Negligible Difference per Car. £ Negligible Signature from Cost Dept. that above is correct. G.R.Rt 16/7/29 Cost of Parts in Works which will be scrapped if commenced on :- Series.........£....... Series.........£....... Series.........£....... INITIAL | DATE | REMARKS Sg{Arthur F. Sidgreaves - MD} | 9-7-29 | Agreed Sg.{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce} | 18.3.29 | Agree. FHR. but I should be very certain before changing if what we have is giving complete satisfaction. R.{Sir Henry Royce} WOR.{Arthur Wormald - General Works Manager} | 15.3.29 | Agreed. Wor.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} | 18.3.29 | Agreed. RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 22.3.29 | Agreed. Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 14.3.29 | Agreed. BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 14.3.29 | What road tests taken re. 10,000 miles. EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 16.3.29 | Agreed. E.{Mr Elliott - Chief Engineer} PN.{Mr Northey} | | CWB. | | HS.{Lord Ernest Hives - Chair} | 14.3.29 | Agreed. HS.{Lord Ernest Hives - Chair} | ||