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 table of specifications for Wraith, Bentley, and 20/25 HP radiators.
| Identifier | ExFiles\Box 9\3\ 03-page001 | |
| Date | 19th March 1935 | |
| x4Tog 646 Hs{Lord Ernest Hives - Chair}/Std23/KW.19.3.35. Comparison of Proposed Wraith Radiator with Bentley and 20/25 HP. Radiators. | Detail | Proposed Wraith | Bentley Expt. short Matrix. | 20/25. | | :--- | :--- | :--- | :--- | | Matrix area | 486 sq.ins. | 356 sq.ins. | 561 sq.ins. | | Matrix depth | 58 m.m. | 58 m.m. | 84 m.m. | | Type of matrix | Marston Mark V | Marston Mark V | Marston Mark III | | Wt. of matrix | 30 lbs. | 22 lbs. | 42 lbs. | | Wt. of radiator empty | 82 lbs. | 67.25 lbs. | 94 lbs. | | Wt. of radiator full | 98 lbs. | 79.75 lbs. | 118.5 lbs. | Hs{Lord Ernest Hives - Chair}/Std. | ||