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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 Morganite EG2 grade brushes for 40/50 & 'S.S.' dynamos as an alternative.

Identifier  ExFiles\Box 172\3\  img122
Date  14th March 1929
  
RR 758 REVISED (10M) (D.C. 777-29-2-28) M.C.LTD
X 8673
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.

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.

Weight of Old Part. Cost of Old Part. £ 0. 4. 5
Weight of New Part. Cost of New Part. £ 0. 4. 5¼
Difference per Car. Difference per Car. £ Negligible.
Signature from Cost Dept. that above is correct. G/Rb.{R. Bowen} 6.7.29. Wor.{Arthur Wormald - General Works Manager}

X No. 8673 7570
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.

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. MIR. 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} | 27.5.29 | Agreed. PN.{Mr Northey}
CWB. | |
HS.{Lord Ernest Hives - Chair} | 14.3.29 | Agreed. Hs.{Lord Ernest Hives - Chair}
  
  


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