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 for Coil No. 3855 from Chassis GF.23, concluding an intermittent short-circuit.
| Identifier | ExFiles\Box 46\3\ Scan237 | |
| Date | 2nd June 1924 | |
| EFC. 2.6.24. WA.{Mr Wallis}37. COIL No.3855 EX CHASSIS GF.23.(BILLSON) This coil was first placed on the 205 V (AC) mains and the milliamperes taken by the secondary winding noted :- 17 (Production limit 15.6) The coil was next placed on the rig and given a short run. It was noticed that at first there was no H.T. discharge but almost immediately after, it started to spark and continued to spark satisfactorily for a considerable time. On putting the coil through the production test it was found to differ from our specification in the following respects:- 1. Running current 1.07 amperes. 2. Primary volts 1.59 amps. 1.61 From these observations it is considered that the coil is intermittently subjected to a short-circuit on one of the windings. As the coil, although given a 15 mins. open circuit, will not break down, further observations necessary to determine if possible which winding was affected could not be carried out. It is recommended that the coil be carefully unwound to ascertain this. EFC/HEW. | ||