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).
List of fuseboard components and a description of an Underwriters' bumper test procedure and results.
| Identifier | ExFiles\Box 19\3\ Scan121 | |
| Date | 23th December 1929 guessed | |
| - 11 - A-6633 Fuse Clip Screw. A-2303 10 Amp. Fuse. A-11341 30 Amp. Fuse. A-10246/9 Fuseboard and Jumper. A-10241 Fuseboard Insulator. A-13655 Fuseboard Casing. A-8500 Fuseboard Casing Cover. A-5905 Fuseboard Cover Screw. A-5906 Fuseboard Cover Screw Locking Ring. This fuseboard is made to be easily convertible to take care of any desired arrangement of fuseboard connections. The names of the circuits are engraved on the face by ourselves, and any number of fuse posts can be connected together by means of jumpers fitting in the slots on the back. Four spare fuses are carried in the cover. 7. Bijur High Pressure Accumulator. D-1122 Accumulator - Bijur Print. 8. Underwriters' Bumper Test. Underwriters no longer do any business in bumper testing nor do they approve bumpers. I am informed that all the specifications and copies of their test sheets have been withdrawn from us so that it is not possible to enclose prints and photographs - We can however give this information as to how the test was carried out. "A bumper was mounted on the frame which was rigidly held. A weight of 2000 lbs. made a number of impacts at the center of the bumper, travelling at increasing speeds as mentioned below. Front Rear 1st. Impact - - - - 1.34 mph 1.34 mph 2nd. Impact - - - - 2.14 mph 2.14 mph 3rd. Impact - - - - 2.95 mph 2.95 mph 4th. Impact - - - - 3.75 mph 3.75 mph 5th. Impact - - - - 4.58 mph 4.58 mph 6th. Impact - - - - 5.41 mph also a second sample was submitted to a single blow - For Front - 6.23 mph For Rear - - 5.68 mph - continued - | ||