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).
Instruction memo to Mr. Royce calculating excessive thrust on a thumb screw spindle and proposing a new design.
| Identifier | ExFiles\Box 1\6\ B001_X2 Double Rear Brakes-page043 | |
| Date | 30th May 1913 | |
| R.R. 500 (6 B (P.P. 382. 8.1 13) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 4114. ROLLS-ROYCE LIMITED. INSTRUCTIONS. 11677 30-5-1913 To Mr Royce Order No. Customer's No. Re A2/B20513 Sheet II in the same direction we actually get a thrust of 75 lbs on to thumb screw spindle, this seems much to great to operate as shown on 'G 10" blue print'. actually figures are:- 20 x 2/16 x 2 x .577 = 77 lbs This is making no allowance for locking spring thrust! It seems to me necessary to adapt a scheme where it is not necessary to push out screw spindle to unlock 'before' turning the screw, somewhat as on sketch herewith! also a light hand wheel say 2.000" dia Knurled on face or outer edge would give a surer grip in twisting motion required. If you will let me know by return your view I will get work in hand at once. Signed RMMB This Sheet must be filed on completion of the work. | ||