Instructions for a utility test of a spark-coil or magneto.
| Identifier | ExFiles\Box 4\5\ 05-page114 | |
| Date | 27th November 1920 | |
| EP {G. Eric Platford - Chief Quality Engineer} 166 (1260) (ST) 24.5.19. MP (8015) X.430 88252 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFE Order No: 25 Customer's No.: 1 Re: X.3199 Utility Test of Spark-coil or Magneto X.430 In place of high non-inductive resistances the secondary of a second standard RR ignition - coil was connected across the gap of a standard RR battery ignition, and various resistances used in its primary. A single gap with third point was used. Max-gap with second coil disconnected = .37" With second coil, primary open = .22" " carbon resistance loose across primary = .15" " " tight across primary = .07" (Cont'd) This Sheet must be filed on completion of the work. | ||
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).