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 a commutator under cold and hot conditions.
| Identifier | ExFiles\Box 50\5\ Scan331 | |
| Date | 29th June 1929 | |
| RR 238(150-pks) (SH57.29-6-29.) WP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. W.A.57 (2) Customer's No. Cold condition The commutator was speeded up to a speed of 6300 rpm and maintained for 2 mins without failure. Hot condition Temperature attained before disconnecting heater for running = 105°C Commutator accelerated up to and maintained at 6300 rpm for 2 mins without failure. The heater was again connected to raise the temperature approximately the same. (temperature attained before again disconnecting = 109°C). Signed Contd. This Sheet must be filed on completion of the work. | ||