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).
Results of electrical circuit tests under varying conditions of current and polarity.
| Identifier | ExFiles\Box 52\3\ Scan331 | |
| Date | 17th October 1919 guessed | |
| Contd: -2- When running current exceeded 1.30 amps. sparking was extremely regular without any sign of misfiring over a period of 15 mins. TEST 2. Connections as in Test 1 but battery terminal reversed i.e. current in whole circuit reversed. Contact breaker speed - 500 R.P.M. Running current = 1.70 amps. Only a slight reduction of 1.70 amps. caused definite misfiring. Practically mo sparking at gaps when current reduced to 1.00 amps. When running current was 1.70 amps. no definite misfire could be visibly detected. The "sound" of successive sparks was however occasionally not quite so even as in the case of Test 1. The "sound" of sparks was louder than in Test 1. TEST 3. Direction of current in primary as in test 2 but direction of current in rest of circuit as in test 1; i.e. terminal marked "Timer" connected to - of battery and " " "Batt" to contact breaker and thro' "earth". to + of battery. Result. indistinguishable from test 2. TEST 4. Direction of current in primary as in test 1 but direction of current in rest of circuit as in test 2, i.e. terminal marked "timer" connected to + of battery and " " "batt" " " contact breaker thro' earth to - of battery. Result. indistinguishable from Test 1. Contd. | ||