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).
The causes of car horn failure in adverse weather conditions like rain and snow.
| Identifier | ExFiles\Box 166\9\ img011 | |
| Date | 19th June 1936 guessed | |
| -2- Horns fail more frequently after the car has done considerable mileage, the reason being that dirt driven in by wind and rain collects inside in lumps and assists the water in building up, whereas a smooth surface allows the water to flow away and eliminate choking. If, however, these horns are driven at speed into a rain storm, the force of wind is sufficient to hold up the water no matter how clean the inside of the trumpet and tube may be. This will only happen under very severe conditions. A further indication of the probability of the foregoing remarks, is that the same trouble occurs in snow when the trumpet gets visibly blocked. | ||