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).
Production test results for Redmand Coil Cases.
| Identifier | ExFiles\Box 69\1\ scan0054 | |
| Date | 5th May 1927 | |
| RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 X8710 ROLLS-ROYCE LTD. INSTRUCTIONS. May. 5th 1927 To EFC Order No. PC 135 Customer's No. X 4079 Production Test of Redmand Coil Cases. Following are the results obtained on three cases representing 10% of the production for the week ending April 30th. The tests made, did not strictly conform with the specification, in so far as the operating voltage of the ignition coil was at times below the specified amount. Case | Proof Test | Leakage Mic.amps | Peak Volts | Ratio Megohms | Remarks --- | --- | --- | --- | --- | --- A | 1 | 64.0 | 7,390 | 115 at 17°C | Operating volts below specified amount (about 5.0) | 2 | 832 | 1,925 | 2.32 | B | 1 | 80.0 | 9,170 | 114.5 at 19°C | | 2 | 775 | 1,925 | 2.49 | C | 1 | 118.4 | 8,140 | 68.7 at 20°C | Operating volts low. | 2 | 865 | 1,350 | 1.56 | Signed C.A.P. This Sheet must be filed on completion of the work. | ||