TAR-SPRAYING OF ROADS AT t-M.P.H.
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I N OUR Special Municipal Vehicle
Issue, which was published on June 5th, we gave details of the various types of high-pressure tar-spraying machines which are produced in the works of British manufacturers, and we referred'to the fact that steam -wagons are principally used for road-surfacing operations of this description.
In the United States and Canada, however, the petrol vehicle is often used for such work, and an example of a tar. sprayer of American manufacture. is illustrated on this page. This comprises an EWA/. chassis, to which a suitable tank and the necessary pressure-feeding and spreading gear have been fitted to enable the vehicle to perform its work economically and efficiently. The particular machine shown was the only transportation equipment used ed by the United Paving and Construction Co., of Vancouver, British Columbia., in connection with a aortaeJag contract which the company executed a short while ago.
The vehicle is the product of the. Four Wheel Drive .Auto Co., of Clintonville., Wisconsin, and the tar distributor with i which it s fitted is of a special design adapted for use on this particular make of chassis.
In •connection with tar-spraying it is necessary, when the tar is being spread on to the road, that a low speed should be maintained by the vehicle during the operation, and, in order to enable this end to be effected, a low-gear ratio is embodied in the vehicle, which allows it to travel as slowly as m.p.h. in low gear with a full-capacity load.
The tar-spraying apparatus is housed at the rear of the machine, asis the usual practice, and the distributors are so arranged that they may be used on roads varying from 8 ft. to 16 ft. in width. The type of spreader which is used is much wider than that which is usually to be found on machines of British manufacture, and it possesses a proportionately greater number of spraying nozzles.
In connection with this F.W.D. vehicle an arrangement is made whereby it is possible to connect a hand distributor to the pumping apparatus, and this enables the vehicle to be used for patching small portions of road and at corners and in cramped spaces where it would be difficult to work with the regular distributor.