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).
Utility test of a spark-coil or magneto.
| Identifier | ExFiles\Box 37\1\ scan 084 | |
| Date | 27th November 1920 | |
| AR 300 (120B) (SF 349 24-1-19) MP 200552 X 3199 88252 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E1Fe Order No.: 25 Customer's No.: 1 Re.: X 3199 27-XI-1920 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. 9.5 mm. Max-gap with second coil disconnected = .375" 5.6 mm. With second coil, primary open = .22" 3.8 mm " Carbon resistance loose across primary = .15" 1.75 mm. " " " " tight across primary = .07" (Contd) Signed This Sheet must be filed on completion of the work. | ||