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 comparing the electrical breakdown of an XM1000 sample against a standard Bakelite sample.
| Identifier | ExFiles\Box 61\1\ scan0112 | |
| Date | 7th May 1930 guessed | |
| (2) W.E 19. Contd. In test (1) no breakdown occurred with either the XM1000 sample or the std Bakelite although the sparks were allowed to pass at the rate of 4200 per minute for 15 mins with a voltage across the coil of 12, and 15 mins at 17.8 volts. In test (2) the magneto was driven at a speed of 700 rpm i.e. 2800 sparks per min, in the first instance. Under these conditions the std Bakelite sample broke down due to surface tracking after 5 seconds whilst the XM1000 with-stood the test for 5 mins before ultimate breakdown. The magneto speed was then increased to 1000 r.p.m and a further test carried out. The std bakelite broke down almost immediately whilst the XM1000 withstood the test for 34 secs before failure. With the magneto speed at 1500 rpm both samples broke down almost | ||