['he Broom and Wade Colonial Tip Wagon.
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" Etc." it will be remembered by all 1.,.• who took part in the R.A.C. cliniorchil Vehicle Trials of last year, -.1 the official designation of the ;room and Wade paraffin-driven 3-ton wry which participated in those trials. y virtue of the nature of the fuel used, le large single-cylinder engine, the Lee l tires, and the many other uncoilcntional features of this machine, no !ss than by reason of its subsequent highly ommuended. " award as the stilt of it low " cast per net ton
mile during the trials, a reputation of considerable value has been built up for the maker, Broom and NVade, Ltd.
In order ,to inspect one of the latest completed models before its shipment to South America, a representative of " THE COMMERCIAL MOTOR " was recently invited down to the works, where every facility was afforded to him for the thorough inspection and testing of the machine under notice, The particular lorry which is the stiblect of the present repert is the tirt of a series
which is to go to i large mining undertaking in Chile.. The service on which these machines are to be em-: ployed consists of the haulage of loads of copper ore over mountain roads of a mean gradienl of i in 8. The road or track in Lhe mountain district has innumerable perilous corners of an: average radius of 15 feet, and, in order to negotiate such acute turnings, the specification, to which the makers have had to adhere, calls for the capability to lock round on an inside radius of eight feet. The provision of a wheelbase which has been shortened to eight feet, and of an exceptionally wide lock on the steering wheels, has enabled the builder to comply with this requirement, The need for some improvement upon the sole means of transport, which is at present at the disposal of the company which owns these copper mines in Chile, has recently been forcibly impressed upon the management by the fact that several of the ore wagons, which are drawn by teams of as many as 8 mules, have accidentally fallen over the sides of the precipitous mountain track. It is to be presumed that the substitution of the more easilycontrollable mechanical haulage will remove the possibility of a number of repeat orders for the Broom and Wade lorry, solely on the basis of a similar contingency.
We reproduce, on the previous page, a side-elevation drawing of the new model of tip wagon. It will be seen that the principal features of the design of the original model have been retained. A fully-illustrated descrip tion of the vehicle which ran in the R.A.C. Trials was published in our issue of the 24th October last year, and it will, therefore, be sufficient on this occasion if attention is drawn to those details of design in which modifications have now been embodied, both on the general principle of improvement in design and also to suit the particular requirements of the service for which these vehicles are intended.
The design of the engine, which has an eight-inch bore and a piston stroke of eight inches, and of the gearbox is practically unaltered. The gears on the tip wagon are designed to give road speeds of eight and four m.p.h. We reproduce a photograph of a set of gears which has been taken down from a wagon that has completed 40,000 miles during three years. Neither the teeth of the main gear wheels nor the jaws of the dog clutches show undue signs of wear. The original pattern of vaporiser has been retained. The engine is mechanically lubricated, and alternative ignition systems of the low-tension magneto and the battery-and-coil types are provided. The special form of lubricator adopted by this company was illustrated and described in that
one of the series of articles on lubricating systems which appeared in our issue of the 3i)th :If July last_
The drive to the live axle is by means of a roller chain of heavier section than the one which was originally fitted. The axle is of the standard pattern, and
is carried on roller bearings, on th housings of which the frame is pivoted An addition to this member of th transmission is the provision of a wind ingdrum on the solid back-axle shaft Means for the locking of the differen tial, or for the operation of the windini drum independently of the road wheels is provided, in the shape of small ban brakes, which are anchored to the out side of the wheel hubs. The coolint system consists of a cellular form o radiator, which is carried in the con ventional position in front of the dash
board. Circulation is maintained 13; means of a pump. Three brakes ar provided; one is applied to the exterio of the large internal gear ring whicl is mounted on the gearbox countershaf and which also provides the reverse; o the other two, one is fixed to the differ ential cage and the other to the side o the hauling drum.
The wagon has the usual form o steel tipping body and its actuatint gear. Steel wheels are fitted ; the fron pair are 3 feet 6 inches and the him pair are 4 feet in diameter. The whet track is 6 feet 6 inches.
The machine has been successfull: driven up a gradient of approximate]: in 8 with a load of over 3 tons.