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).
Test results for secondary milliamps, primary point gap, and contact breaker timing.
| Identifier | ExFiles\Box 40\2\ Scan071 | |
| Date | 17th December 1925 guessed | |
| -5- (14) Secondary milliamps : Maximum :- 13.2 Minimum :- 4.0 (15) Primary point gap after previous tests :- .011" Primary point gap .015" Contact breaker timing. Make. Break. A.{Mr Adams} 28.5° 99.5° R.{Sir Henry Royce} 88° 160° Retard. Advance. Make. 88° 29° Break. 161° 100° Make. 268° 208° Break. 339° 279° Make ratio:- .395 Primary point gap :- .007" Contact breaker timing. Make. Break. A 22° 104.5° R 81.5° 164.5° Retard. Advance. Make. 82° 23° Break 166° 105° Make. 261° 201° Break 343° 284° Make ratio:- .457 Average variation from normal = 3° | ||