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).
Blueprint showing specifications for modified American-style ball pins for connecting tubes.
| Identifier | ExFiles\Box 151\2\ scan0333 | |
| Date | 22th April 1917 | |
| .437 DIA. .475 Sph. RAD. .950 DIA. UNALTERED. .275 FOR 1.000 BORE TUBE STEM TO BE MACHINED TO SUIT THE PARTICULAR APPLICATION FOR WHICH THE BALL PIN IS INTENDED. .475 DIA. .537 Sph. RAD. 1.075 DIA. .337 FOR 1.125 BORE TUBE MODIFIED BALL PINS - AMERICAN SCALE 1/1 CONNECTING TUBES. N.S.CH. 5130 AM. 22.4.17 ROLLS-ROYCE LTD. PRINT ROOM 24 APR 1917 | ||