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).
Instruction sheet detailing the examination and noted faults of a dynamo with high output.
| Identifier | ExFiles\Box 70\3\ scan0295 | |
| Date | 23th June 1927 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. To EFC Order No. PC 140 Customer's No. X8783 Customer's Faulty Dynamo TA.35 Off Chassis 68.SC. The complaint concerning this dynamo was, that the output was high. From examination and test of this machine the following points were noted:- 1 On testing the insulation of the complete machine, a partial break-down was observed. This was subsequently found to be due to carbon dust bridging the insulation of the control brush holder. 2 The inner control brush, and both negative brushes were found to be sluggish in their respective holders. The outer negative brush in particular was sufficiently gummed in its holder (by a mixture of oil and carbon dust) to render the spring useless. 3 The surface of the commutator was blackened, but the surfaces of the brushes were in reasonably good condition. 4 Solder was found to be melted from the commutator connections, but the armature Signed Cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||