CLEARING AND LIGHTING THE ROAD SOME OUTSTANDING ACCESSORIES FOR FAST TRAVEL FOR a long-distance yet pleasant sounding warning signal it would be difficult to find a better instrument than the motor-driven blower type, and the range of Sanor horns which are stocked in this country by Messrs. C. V. Desiderio, cover all requirements in this respect. The RD type, which costs ,28 15s. Od., is amply powerful for cormal use, the two-trumpet pattern gives additional range, while the Sanor-Impetior,
which costs 18s. od., is the roadclearer par excellence, and can be heard a mile away. In spite of their carrying power, however, these horns are sensitive to the pressure of the horn button, and may ‘be used in town without giving offence. The working parts of the blower-type horn are not unlike those of a single-rotor supercharger, the rotor, which is mounted eccentric to the outer casing, having three blades which slide in slots and are thrown outwards by centrifugal force. The compressed air escapes into a chamber at the top of the horn, and is forced through holes tin a metal diaphragm, the vibrations of
which combined with the air-pressure behind them giving the distinctive carrying note. A vacuum operated horn selling at 37/6 is also available, and we were interested to discover that except for a momentary weakening when the accelerator is depressed to the full extent, the note remained constant at all throttle openings. The well-known Marchal lamps are another Desiderio speciality. Their distinc
live feature is the sectional reflector, which makes it possible to have both filaments of a double filament bulb to be in focus. The dipped beam extends for an unsually long distance in front of the car, while the powerful main beam is spread right across the road by the special construction of the reflector, while a crystal diffuser is used to give even illumination close to the source.
The prices of the headlamps range from .6.11 tos. od. to £30 5s. od. per pair, while some excellent spot lights and fog lights are also available. Moderately priced sets averaging about £8 can be had to replace existing headlamps on American cars.
On most of these it has been found advantageous to replace the existing wiring with new cables of heavier gauge, and if this is done, the light given by the six volt bulbs is in no way inferior to that from 12 volt lamps of equal wattage.
Catalogues of Sanor horns and Marchal headlamps may be obtained by readers of ” Motor Sport ” post free from C. S. Desiderio, 143, Whitfield Street, London, W.1.
