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).
Experimental dynamo record sheet for a 20 HP engine.
| Identifier | ExFiles\Box 51\1\ Scan419 | |
| Date | 21th November 1923 | |
| X4383 20 HP. EXPERIMENTAL DYNAMO RECORD SHEET DYNAMO: B (I) X 4383. Date. | Location. | Particulars. | Chassis Miles Reading. | Total dynamo miles. 21 July 1922 | Lab. | Bench tests and adjustments. | - | - 22 July 1922 | 6 GII. | Tested se | - | - 15 June 1923 | " | Tested. Comm good but Black. Brushes old position | - | - 30 " " | " | Tested for non charging. New brushes. 72° Sent'l on 73° coil. | - | - 2 July " | " | Sew Oil for 73° oil. | - | - 11 " " | 4 G.I. | Transferred from 6GII with engine. | - | - 25 " " | " | Sent'l 82°. Comm excell't. Brushes O.K. | 6 | - 10 Aug " | " | Comm. & +&- brushes OK. Sent'l doubtful. | 753 | - 17 " " | " | New 82° sent'l on | 1826 | - 25 " " | " | Sent'l gone [Brushes OK, positive 1/2 higher 1/2 duller]. | - | - 30 " " | Lab | Rec'd for modernizing. Dirty, down on 20 vac. Comm V.G. | - | - 22 Sept " | " | Main brushes retarded. Springs +15, -15 [10 (lb)]. Control brush OK by gauge. Set to 11x spec'n. | - | - 4 Oct " | 3G.I. | 88° sent'l fitted. V. {VIENNA} clean under cover Comm clean [Brushes OK] | 1734 | 0 8 " " | " | | 1973 | 239 16 " " | Lab | Rec'd Checked prod'n test. 11-0x. other partic's OK. Springs +1.25, -1.25, c.b.Brushes all ch's. Comm good. | 2091(357) | - 21.Nov. 23. | " | Tooth drag test - Stiff turning, slight extra tooth. Springs + .7, -1.3, c.b(lbs) + 2c & enlarged spiral design. | - | - | ||