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).
Comparison of weights and capacities for four different types of radiators.
| Identifier | ExFiles\Box 3\3\ 03-page069 | |
| Date | 11th August 1912 | |
| COPY. X200 Standard radiator weight 88 lbs empty. Capacity 5.125 galls. full. Hemingways radiator weight 91 lbs empty capacity 3.0 galls full. Zimmerman radiator weight 77.5 lbs capacity 4.375 galls. full Ferman radiator weight 82 lbs empty capacity 2.525 galls. full. E.P. 11/8/12. | ||