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 report on a coil connected to six graduated spark gaps, measuring performance over time.
| Identifier | WestWitteringFiles\K\September1923\ Scan7 | |
| Date | 21th September 1923 guessed | |
| -2- Contd. Test 1. In this test the coil was connected to the six spark gaps in the ordinary way, the gaps, however, being graduated from 6.5 mm. to 4.0 mm. in length, viz:- Gap No.1 6.5 mm. " No.2. 6.0 mm. " No.3. 5.5 mm. " No.4. 5.0 mm. " No.5. 4.5 mm. " No.6. 4.0 mm. The coil was commenced sparking and at the end of every fifteen minutes the largest of the six gaps at which regular sparking occurred, noted. Time from Max. regular commencement of sparking gap. heating-up process. mm. (1) (2) (3) Std. Mould- Redmanol. Remarks. ensite. 0 mins, 6.5 6.5 6.5 15 " 6.5 6.5 6.0 30 " 6.5 6.0 5.5 45 " 6.5 6.0 4.5+ +Spark on No.1 gap (6.5 mm) out. 60 " 6.5 5.0 4.0+ +Sparks on gaps 1, 2, & 3 out. 75 " 6.5 5.0+ - +Spark at No.1 gap out. 90 " 6.5 4.0+ - +Sparks on gaps 1, 2 & 3 out. 105." 6.5 - - 120." 6.5 - - Contd. | ||