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).
Graph from calorstat tests comparing a Smith's standard production model with a packless gland type.
| Identifier | ExFiles\Box 156\1\ scan0036 | |
| Date | 27th December 1933 | |
| CALORSTAT TESTS E80893 27-12-33 COMPARISON BETWEEN SMITH'S 'H' FILLING STANDARD PRODUCTION - AND 'PACKLESS GLAND' TYPE, THE LATTER BEING OFF P J II PRACTICALLY NEW. MAX BELLOWS MOVEMENT .500" SHUTTERS 'OPEN' SHUTTERS 'CLOSED' LEGEND: --- SMITH'S STANDARD -x- 'PACKLESS' AXES: TEMP °C PULL - LB PUSH - LB | ||