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).
Instructions and test results for a 'Radamax' Plug Lester.
| Identifier | ExFiles\Box 50\2\ Scan006 | |
| Date | 27th November 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 X. 4294. 88253 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFC Order No: 26 Customer's No.: 1 Re: X 4294 "Radamax" Plug Lester On a magneto gap, slightly too wide for sparking normally, the "Radamax" will cause sparks to pass almost regularly, showing also at the sight-hole. Placed across a normal gap (i.e 6.5 mm) on battery ignition it extinguishes the spark and does not show at the sight-hole. Max-gap for regular sparking with "Radamax" on battery ignition for 300 rpm = .18" = 4.57 mm. Max-gap for 300 rpm = 4.57 mm. " " " 900 rpm = 3.81 mm. (CONT'D) Signed This Sheet must be filed on completion of the work. | ||