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).
Criticisms of the Harrison car heater compared to the Clayton model.
| Identifier | ExFiles\Box 137\1\ scan0327 | |
| Date | 15th December 1937 | |
| To Hn.{F. C. Honeyman - Retail orders} from Rm{William Robotham - Chief Engineer}/Std. CAR HEATERS. Referring to your VA7/AH.13.12.37, we presume that when you refer to the American Heater that you mean the latest model marketed by Delco Remy Hyatt Ltd., i.e. the Harrison Twin Flow model. If this is so we have had several of these heaters running. This type of heater gives a considerably greater output than the Clayton heater S.2.CA. type which is probably the one which you have been in the habit of fitting - approx. 60% more in fact - but it may be mentioned that Messrs. Claytons have another model, the CC type, which gives a somewhat bigger output than the first one mentioned above. Attached sheet shows the relative weights, outputs etc. of the Clayton and Harrison heaters. Our criticisms of the Harrison heaters are as follows - (1) In view of the lack of adequate rheostat control over the fan motor and large air delivery the large heat output can be a disadvantage except in the coldest weather since it involves continued switching on and off of the heater. (2) The directional control of the air flow is such that a hot blast of air is obtained in the direction governed by the doors, instead of a gentle circulation. (3) The door mountings of all the Harrison heaters have shown signs of developing rattles. (4) A certain amount of water circulation noise has been experienced. (5) The heater is rather a bulky affair, its dimensions (6) The motor and fan are noisy. | ||