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).
Specification sheet comparing the weight and capacity of four different radiators.
| Identifier | ExFiles\Box 3\3\ 03-page068 | |
| Date | 11th October 1910 | |
| 124 X496 Standard radiator weight 88lbs empty. capacity 5.125 galls full. X498 Hemingways radiator Weight 91 lbs empty. Capacity 3.0 galls. full. X 54 Zimmerman radiator Weight 77.5 lbs weight. Capacity 4.375 galls. full. X497 Ferman radiator Weight 82 lbs empty. Capacity 2.625 galls. full. X200 RR 11/10/10 | ||