Test report detailing secondary milliamps, primary point gap measurements, and contact breaker timing results.
| Identifier | ExFiles\Box 40\2\ Scan199 | |
| Date | 7th October 1938 guessed | |
| -5- (14) Secondary milliamps :- Maximum :- 15.0 Minimum :- 4.2 (15) Primary point gap after previous tests :- .010". Primary point gap .014". Contact breaker timing. Make. Break. A -2.5° 94° R 57.5° 154° Retard. Advance. Make. 58° -2° Break 154° 94° Make. 237° 177° Break. 334.5° 274.5° Make ratio :- .536. Primary point gap :- .006". Contact breaker timing. Make. Break. A -7.5° 100° R 52.5° 160° Retard. Advance. Make. 53° -7° Break 160° 100° Make. 232° 172° Break 340.5° 280.5° Make ratio :- .597. Average variation of break = ±3° Contd. | ||
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).