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).
Electrical experimental record sheet for British Carbon Brushes Grade B 40/50.
| Identifier | ExFiles\Box 166\1\ img004 | |
| Date | 23th August 1932 | |
| X.No. X6093 C Item No. ELECTRICAL EXPERIMENTAL RECORD SHEET. Description of item:- British Carbon Brushes Grade B. 40/50 | Date | Location | REMARKS | Miles reading Start | Miles Covered | Total Miles | |----------|----------|-------------------------------------------------------------------------------------------------------|---------------------|---------------|-------------| | 20-7-31 | 22 Ex. | Positive and control brushes only submitted by B.C. Co. Heating tests and commutation observed on bench. Dynamo No. 9. | 14,280 | | | | 1-9-31 | " | Reading taken. | 16,077 | 1,797 | 1,797 | | 6-10-31 | " | " | 17,682 | 1,605 | 3,402 | | 4-11-31 | " | " | 18,796 | 1,114 | 4,516 | | 18-12-31 | " | " | 21,073 | 2,277 | 6,793 | | 5-1-32 | " | " | 21,845 | 772 | 7,565 | | 1-2-32 | " | " | 22,715 | 870 | 8,435 | | 5-3-32 | " | " | 23,703 | 988 | 9,423 | | 4-4-32 | " | " | 24,801 | 1,098 | 10,521 | | 2-5-32 | " | " | 25,460 | 659 | 11,180 | | 8-6-32 | " | " | 27,276 | 1,816 | 12,996 | | 1-7-32 | " | " | 28,977 | 1,701 | 14,697 | | 23-8-32 | Sub- | Removed as test completed. | 31,568 | 2,591 | 17,288 | | ||