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 Carbons Brushes, Grade B.
| Identifier | ExFiles\Box 62\3\ scan0204 | |
| Date | 5th March 1932 | |
| X.No. 6065 Item No. X6065 ELECTRICAL EXPERIMENTAL RECORD SHEET. Description of item :- British Carbons Brushes, Grade B. 20/25 size. Date on. | Location. | REMARKS. | Miles reading start. | Miles covered. | Total miles. 4-12-31 | 19 G | Positive and control brushes only submitted by B.C. Co. | 20,204 | | 1-1-32 | " | | 20,990 | 786 | 786 1-2-32 | " | | 22,667 | 1,677 | 2,463 5-3-32 | Lab. | Removed for scintilla to be fitted. Borrowed for trial on Tank and taken away by mistake on that unit. | 24,246 | 1,579 | 4,042 | ||