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).
Oil pressure test results for Firths rolled eye low rated springs on a 40/50 bumper chassis.
| Identifier | ExFiles\Box 154\1\ scan0064 | |
| Date | 20th November 1933 | |
| X6029 20.11.33. OIL PRESSURE TESTS ON FIRTHS ROLLED EYE LOW RATED SPRINGS ON 40/50 BUMPER CHASSIS. POSITION OF SPRING: | PRESSURE APPLIED LBS/SQ:IN: | FRONT OR REAR EYE: | POSITIONS OF LEAKS & SEQUENCE IN WHICH LEAKS OCCURRED. --- | --- | --- | --- O.S.R (F.85180.) | 4 | Rear | Spring leaves, eye, & tube. O.S.R. | 6 | Front | - Ditto - N.S.R. | 4 | Rear | Tube, end of leaves, & eye. N.S.R. | 6 | Front | Wearing washer, eye & tube. (This leaked too fast past washer to cause heavy leak at tube & eye.) N.S.F. (F.85191) | (a) 10 lbs. (b) 19 lbs. (c) 24 lbs. | Front. | (a) Shackle Pins (b) spring leaves, (c) Tube & eye. N.S.F. | 30 | Rear | Eye, tube, spring leaves, washer. O.S.F. | 7 | Front | Eye, tube, spring leaves, shackle pin. O.S.F. | 11 | Rear | Tube, eye, spring leaves, shackle pin. | ||