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 fault diagnosis of two faulty coils.
| Identifier | ExFiles\Box 70\3\ scan0126 | |
| Date | 3rd February 1928 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 481-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To E7C Order No. WC70 Customer's No. X8710 X4079 3 - 2 - 19 28 X 8783d Coils Nos 4405 and T145X ex Repair dept. These two coils when examined and tested shewed a weakness of secondary spark. The continuity of the winding was OK and the coil quantities measured on the bench were also OK. It is considered that the fault occurred owing to leaky secondary insulation, and both coils were unwound. It might be added that both coils were treated with paraffin wax as described in WC69 without any appreciable improvement accruing thereby. Coil No 4405 when unwound shewed that the oil paper on the secondary winding in some places was still Signed contd This Sheet must be filed on completion of the work. | ||