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).
Page detailing a series of electrical and durability tests for cables, including insulation and chassis trials.
| Identifier | ExFiles\Box 52\1\ Scan138 | |
| Date | 6th February 1930 guessed | |
| -2- immersed in water for 4 hours. In this condition the cable should be tested for breakdown, the breakdown voltage (if attained) being noted. (6) Observe the cracking effect on the insulation due to high voltage oscillatory brush discharges passing over the surface of the insulation to earthed clips thereon. This test to be carried out over a length of time according to judgement as to the rapidity with which the cracking effect is produced. (7) A sample length of cable should be bent into a loop about 1½" internal diameter, and the loop made to rest upon or touch a hot metal body (at 100°C) at earth potential. A voltage of 10,000 R.M.S. should then be impressed between the conductor and the hot metal body for 30 mins. If this does not produce failure the voltage should be raised and the time extended accordingly. C. Chassis and subsequent tests. (8) A half set of ignition wires made up with the cable should then be run sandwiched with a standard set on both the magneto and battery ignition (where both exist) on an experimental chassis, for a distance of 10,000 miles at least. An examination should then be made of the dielectric condition. (9) Repeat electrical test No.4 as detailed aboge. EFC. {E. Fowler Clarke - Electrical Engineer} | ||