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).
Graph comparing the heat dissipation efficiency of various radiator types against air velocity.
| Identifier | ExFiles\Box 149a\2\ scan0387 | |
| Date | 1st May 1936 guessed | |
| Comparing Efficiency of= Mc.Cord. 82% : Fedders 70% & 82% (Estimated) : Marston (machine made) Mk VI 84% Y-Axis: Heat Dissipated an H.P. per 2 sq. ft. F.A. 100°F T.D. Water Inlet & Air Inlet X-Axis: Air Velocity M.P.H. Left Table: TYPE - EFFICIENCY % FEDDERS - 70 Mc CORD - 82 MARK VI - 84 MODINE - 76 (Lown) - Low 76% Bottom Left Table: Weight of Mc.Cord 82% - 22 lbs. Weight of Fedders 70% - 20 lbs. Weight of Modine 76% - 21 lbs. Weight of Marston MKVI 84% - 24.5 lbs. Graph Line Annotations: Mc C. 15 galls & Fedders 82% (Estimated) Mc C. 4.3 galls MK VI 12 galls 84% Feds. 70% 15 galls MK VI 30 galls Feds. 30g Modine 76% 15 galls LOW | ||