Blueprint showing a cross-section and dimensions for a Tappet Spindle (Twin Series B).
| Identifier | ExFiles\Box 13\3\ 03-page289 | |
| Date | 3rd January 1928 | |
| For Other Dimensions See (E.20A.) TAPPET SPINDLE (TWIN SERIES B.) 1.600 +2 1.600 +2 1.000 +5 1.700 +5 .250 +1 .248 +1 V1032 [Faint, top left] 3.1.28 | ||
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).