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 sheet from Thos Firth & John Brown Ltd for the Spiral Department, recording spring measurements under various loads.
| Identifier | ExFiles\Box 95\2\ scan0225 | |
| Date | 16th July 1919 | |
| TEST SHEET. THOS FIRTH & JOHN BROWN LTD. 487 SPIRAL DEPT. N 1860 Date: 16-7-19 ORDER No.: For: Messrs Rolls-Royce Ld. Order: Rate 1368 lbs per 1" Drawing: G 83698 Height free: 8.675 With load of: 2798 lbs to be 6.63 / (4465 lbs - 80) 5.41 Outside Diameter: 4.775 Inside Diameter: 3.275 Section: .755 dia Mark: Weight: Coils: 7 1/4 R/H Table: Headers: No 6, No 7, No 8, No 9 Height free: 8.75, 8.75, 8.69, 8.75 with cwt. 2798 lbs: 6.625, 6.625, 6.62, 6.625 with cwt. 4465 lbs: 5.54, 5.5, 5.5, 5.5 Home: 5F, 5B, 5, 5F Passed this day Passed previously Total For THOS. FIRTH & JOHN BROWN LTD., | ||