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).
Instructions detailing pressure measurements for brushes on various dynamo models.
| Identifier | ExFiles\Box 50\5\ Scan197 | |
| Date | 6th November 1918 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No Customer's No. E are .3 lb on each of the main brushes and .4 lb on the control brush. On the dynamo of 3GI (No R3) the pressures are, positive 1.25 lbs, negative .9 lb. The brushes are very little worn. On 2GI which has an early machine marked A on which the brushes are very much worn, the pressures are, positive .5 lb, negative .8 lb. On 7GI dynamo (No R1) where the brushes are moderately worn, the pressures are, positive .5 lb, negative .4 lb. The control brush is not accessible for spring testing on the cars. Signed (Cont'd) This Sheet must be filed on completion of the work | ||