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).
Results of radiator comparison tests conducted at Brooklands.
| Identifier | ExFiles\Box 87\1\ scan0161 | |
| Date | 10th July 1935 | |
| RESULTS OF RADIATOR COMPARISONS AT BROOKLANDS 10.7.35. Conditions. - Full throttle, full speed, 87 M.P.H. approx. No shutters or grille fitted. ALL TEMPERATURES IN DEGREES CENTIGRADE. Matrix. | Air Temp. | Bottom Water Temp. T2 | Top Water Temp. T1 | Mean Water Temp. T1+T2/2 | Air Temp. to boil °C. | Bonnet Temp. ----------------------------|-----------|-----------------------|--------------------|--------------------------|-------------------------|------------- (a) Std. 58 mm. Marston | 28 | 69 | 80 | 74.5 | 50.5 (crossed out) 48 | 44 Mark V Matrix. | (b) 52 mm. Marston | 26 | 63 | 74 | 68.5 | 58.5 (crossed out) 52 | 45 Mark V1.M trix. | (c) 52mm. Harrison | 26 | 61 | 72 | 66.5 | 58.5 (crossed out) 54 | 45 Vee bonded Matrix | (Latest American type). | Ha/Std. | ||