A Fog Lamp of Unusual Design
Page 59
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IN the operation of bus services in particular, and of goods vehicles to only a slightly smaller degree, there are few more annoying and less-controllable forces than fog. Public inconvenience, danger and financial loss are three of the major items incurred, and any assistance which can be obtained to permit the continuance of services is worthy of serious consideration.
As befits one of the best-known makes of electrical accessory, the recently introduced Bosch fog lamp marks a distinct stage in the progress being made with fog-piercing lights. As regards the design, the general appearance is pleasing. On account of its unusual construction there is much of interest. In operation, the practical advantages of the device attract favourable comment.
An unusually robust form of lamp front is used because it serves to carry the lamp-holder, glass and reflector, to
gether with its casing. The sturdy bracket is secured by two setscrews to the lamp front. The lamp-holder is mounted in a vertical position, whilst the glass front is at approximately 85 degrees to the horizontal.
This lamp, which is, at present, listed at £3 10s. 9d., can be supplied in various
finishes. The most popular is black with a chromium rim. Either 6-volt or
12-volt bulbs cam be Supplied. It is handled by Bosch, Ltd., Larden Road, Acton Vale, London, W.3.
Considerable importance attaches to the proper setting of the lamp. Clearly worded instructions are provided, and when these are obeyed, it is found that the beam thrown by the lamp can reach as far as 50 ft. in front of the vehicle. The best results are obtained when the lamp is inclined upon its mounting, so as to give a beam varying from 33 ft. to 50 ft. In addition to the length of beam obtained, which, as we have proved in a dense fog, is by no means an exaggeration, there is a fan of light which, at about 20 ft. range, is approximately double the width of the vehicle.
From the driver's point of view, an unusual feature is that there is generous lighting of the road ahead, but without any troublesome effects due to light rays passing upwards from the lamp. This is no doubt due to the special slimpe of the reflector.
Any model of this lamp can be supplied with suitable mounting clamps for bars from in. to 1 in., whilst the angle bracket attached to the lamp affords easy anchorage.
For commercial-vehicle work, the robust construction is an advantageous feature, and the really useful white light which it gives, under the trying conditions encountered in foggy weather, makes the lamp a value-for-money proposition.