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).
Instruction note comparing the performance of different spark plug brands.
Identifier | ExFiles\Box 33\3\ Scan093 | |
Date | 3rd January 1921 | |
ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Col Harker Date: Jan 3rd 1921 re Plugs. Cooke's plugs only run 1500 miles & then gave trouble with internal shorts. Campion plugs run very well & give no trouble after 2000 miles test & still fitted in engine. Lodge plugs do not suit our oily engine Signed: H Clarke RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 This Sheet must be filed on completion of the work. X.1812 C. | ||