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 weights for different Bentley radiator configurations.
| Identifier | ExFiles\Box 88\3\ scan0105 | |
| Date | 3rd January 1935 guessed | |
| BENTLEY RADIATOR WEIGHTS. Component Std. Bentley Rad. 58 mm. Mark III Matrix & Narrow Bottom Tank. otherwise Std. 58 mm. Matrix & all possible lightening. Matrix 36 lbs. 4 ozs. (crossed out) 38 LBS 29 lbs. 0 ozs. (crossed out) 31 LBS 8 ozs 23 lbs. 3 ozs. (crossed out) (area reduced by 20%). 25 LBS 3 ozs Top Tank 2 lbs. 14 1/2 ozs. 2 lbs. 14 1/2 ozs. 2 lbs. 10 ozs. Bottom Tank 5 lbs. 3 ozs. 4 lbs. 11 ozs. 4 lbs. 11 ozs. Shell and odd fittings - solder etc. 26 lbs. 0 ozs. 24 lbs. 12 ozs. 23 lbs. 0 ozs. Shutters & Controls 12 lbs. 14 ozs. 12 lbs. 14 ozs. 7 lbs. 7 ozs. (Grille) Water 20 lbs. 0 ozs. 13 lbs. 12 ozs. 11 lbs. 3 ozs. Total 103 lbs. 4 ozs. 88 lbs. 0 ozs. 72 lbs. 2 ozs. Saving in weight over standard - 15 lbs. 4 ozs. 29 LBS 2 ozs (crossed out) 31 lbs. 2 ozs. Hm{Capt. W. Hallam - Head Repairs}/C.S.Steadman. | ||