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).
Test data and remarks for a 20 HP Dynamo, model 931, with EJB poles.
| Identifier | ExFiles\Box 165\6\ img164 | |
| Date | 18th April 1928 | |
| X.5660 18.4.28. 20 HP. DYNAMO 931. WITH EJB POLES (FROM 288) FOR CUSTOMER (BARTRAM CH.GCK-76) Volts. | Speed. | Remarks. 10.0 | 780 | T = 80°C. attained at approx. 12.0 | 830 | sch' volts. 14.0 | 880 | Main brushes 13 1/2° retarded 15.0 | 900 | (due to poles). 17.0 | 955 | Control brush at 120°. ---------------------------------------------------------------- Amps. | Speed. 1.0 | 870 | Rough curve handed to Ry/Cgh.{W Clough} 3.0 | 915 | Car at present at Cricklewood 5.0 | 1010 | for Repair. C. has agreed 7.0 | 1115 | to fitting of special machine 9.0 | 1235 | to car. 11.0 | 1385 | Ry/Cgh.{W Clough} writing to ascertain 11.7 | 1625 | particulars for despatch. 11.5 | 1950 | Inform Mr.Priestly of Ry/Cgh{W Clough}'s 11.0 | 2355 | instructions for issuing out 10.3 | 2825 | of Exptl. Dept. etc. 9.7 | 3235 | Dynamo sent to despatch. 9.5 | 3575 | | 3670 | T = 76° | ||