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 comparing the performance of Smith's 'H' filling and 'Packless Gland' type calorstats after 10,000 miles.
| Identifier | ExFiles\Box 156\1\ scan0037 | |
| Date | 27th December 1933 | |
| CALORSTAT TESTS COMPARISON BETWEEN SMITH'S 'H' FILLING - TAKEN WHEN STANDARDISED ON PRODUCTION - AND THE "PACKLESS GLAND" TYPE OFF I B4 - AFTER 10,000 MILES. SHUTTERS "CLOSED" POSITION "PACKLESS" - I B4 SMITH - STANDARD PULL - LB PUSH - LB | ||