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 detailing a modification to a Crosby Indicator for use with hydraulics.
| Identifier | ExFiles\Box 52\1\ Scan005 | |
| Date | 7th January 1933 | |
| CROSBY INDICATOR 7-193 Hs. {Lord Ernest Hives - Chair} 135 7.1.33 FOR END DIMENSIONS SEE E 27486 E 27436 E 27485 ¼ COPPER PIN. MODIFICATION TO INDICATOR FOR HYDRAULICS | ||