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).
Experimental drawing of a Needle Valve (A1) showing taper dimensions.
| Identifier | ExFiles\Box 13\4\ 04-page029 | |
| Date | 24th August 1977 | |
| V/406 .145 DIA AT TOP OF TAPER ±1 .075 3°-12' ANGLE TAPER .085 DIA AT BOTTOM OF TAPER ±1 OTHER DIMENSIONS SEE EX7877 NEEDLE VALVE (A1) EXPD'G ROLLS-ROYCE, LTD. PRINT ROOM AUG 24 1977 DLR Y 24-8-77 | ||