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).
Request to order a resistance unit for ignition coil tests and an updated Zenith catalogue.
| Identifier | ExFiles\Box 63\1\ scan0212 | |
| Date | 5th November 1929 | |
| X.3035. Roy.{Sir Henry Royce} from EFC. EFC1/AD5.11.29. RESISTANCE FOR IGNITION COIL TESTS. Will you please order from The Zenith Mfg. Co. one Z.7. Zenite Vitreous Resistance unit of 15000 ohms resistance and .1 ampere current carrying capacity. This is required in connection with breakdown tests of ignition coil primaries and secondaries. Catalogue price in 1923 catalogue 17/4d. less discount. Will you please obtain for us an up to date Zenith catalogue of resistances. EFC. | ||