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).
Tests regarding bonnet ventilation to reduce water temperature and keep floorboards cool.
| Identifier | ExFiles\Box 75\4\ scan0085 | |
| Date | 9th May 1912 guessed | |
| V There is however sufficient difference in the temperature readings to show the advantage of this scheme. I have had these tests confirmed and found O.K. [handwritten: to a few degrees] and have also made several tests showing the effect of allowing the air to escape from the bonnet (after passing through the radiator) very easily. The water temperature for instance can be reduced by taking out the side guards entirely. Taking out a few louvres [strikethrough: for instance] does not make any noticeable difference, the fitting of a louvred bonnet is an improvement. I have before me figures showing the advantages of these points, but they are not quite complete and will send same to you in a day or so. In the meantime there does not seem to be any reason why this scheme should not be adopted as there is great advantage as regards keeping floorboards cool, the change in temperature under R | ||