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 report on various grades of Goshawk Dynamo twin type brushes.
| Identifier | ExFiles\Box 50\5\ Scan351 | |
| Date | 6th November 1924 | |
| EFC. {E. Fowler Clarke - Electrical Engineer} 4333 6.11.24. GOSHAWK DYNAMO- TWIN TYPE BRUSHES. The following brushes to EFCL/T12.9.24 to D.51330 (Control) and D.51331 (Main) have been received for test. Grade and No. Particulars. Remarks. Z Main and Control. 12 sets { Main 49 Control 24 Riveted connection. Bevelled. Chamfered. Larger contact surface radius. No lugs fitted. One control brush cracked. 3 sets handed to RHC {R. H. Coverley - Production Engineer} for machines J, K L. LFC2 Main and LEC3AB8 Control. 2 sets { Main 8 Control 4 " " X Main and EG3399 Control. 2 sets { Main 8 Control 4 " MORGANITE. EG2 Main and Control. 2 sets { Main 8 Control 4 Collar connection. Bevelled. Larger contact surface radius. Without lugs. Brushes are not chamfered. Upper portions of control brushes are coppered. EFC. {E. Fowler Clarke - Electrical Engineer} | ||