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 results for inflammability and electrical breakdown on various material samples.
| Identifier | ExFiles\Box 52\1\ Scan119 | |
| Date | 8th December 1924 guessed | |
| RR 238 (150 BKS.) (DB {Donald Bastow - Suspensions} 451-B.12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (3) To _________ _________ 19__ Order No. WD {Mr Wood / Mr Whitehead} 92 (contd) Customer's No. _________ Effect on "Helsby" — slight softening. " " "Maconite" — none appreciably. All four samples ignited with the same degree of moderate inflammability when exposed to a naked flame. Section B Electrical breakdown Tests. ④ "Gloverite" — successfully withstood 19,000 Volts R.M.S. for 15 mins "Super Glover" — ditto. "Helsby" — Broke down at 19000 Volts R.M.S. "Maconite" — successfully withstood 19,500 Volts R.M.S. for 15 mins ⑤ "Gloverite" — Successfully withstood 19,100 Volts R.M.S for 15 mins "Super Glover" — ditto. Signed (contd) This Sheet must be filed on completion of the work. | ||