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LLOOSE LEAVES TN connection with -I-the recent World's Tractor Trials
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some interesting figures have been prepared to show the difference in per formance between the rubber-jointed track of the Roadless type, as installed on a Rushton machine, and the pin-jointed tracks used by six other machines. The percentages of drawbar pull to weight in the case of the Rushton-Roadless were 88.6, 61.9 and 36.1 en the three forward gears. The comparative average figures for the tractors using pin-jointed tracks were 66, 45.8 and 27.8. The Citroen-Kegresse, with its rubber-belt track, gave results of 88.7, 65.6 and 31.7 per cent.
A FEATURE of the successful demonstration of the A.E.C. high-speed oil engine, recently held at the company's Southall works, was a series of 20-minute runs in modern double-saloon buses equipped with the new power unit. On one of these runs the vehicle was stopped by the police on the Great West Road for travelling at 45 m.p.h. If any ignothiny attaches to the hold-up it is offset in importance by the proved ability of the heavy-oil engine to attain speeds, when used in buses carrying double-deck bodies, equal to those of the petrol engine.
B18 HOW risks of fire are reduced to a minimum on the modern oil tanker are indicated by the methods adopted in the motor-driven vessel " Appalachee " (12,400 tons displacement), which was recently launched at Hebburn-on-Tyne for the Pratts motor-spirit concern. The tanks, which will carry 3,450,000 gallons of spirit and oils, are placed well out of danger's way ; a new patent vapour system prevents dangerous contamination between one grade of cargo and another. A system of sprinklers provides "artificial rain," thus keeping, during hot weather, a thin film of water on the decks. One of the most modern fire precautions is equipment to distribute carbon-dioxide gas, which is stored in steel cylinders.
IT is officially estimated that road transport in 1929 caused a reduction of Rm. 410 million in the revenue of the German railways. Of this reduction RM. 37 million is the figure attributed_to public roadpassenger services, about Rm. 153 million to the use of motorcars and Rm. 220 million to road goodscarrying services. Of the last-noted figure about 40 per cent. is attributed to transport companies and 60 per cent. to industrial concerns that are now carrying their own goods by road. THERE is food for thought in the latest of the S.M.M.T. Provisional Standards, which relates to giant balloon tyres, and quotes data for tyres of 13i ins. section. Assume a. wing overhang, beyond the outer tyre, of 2 ins., and 2i ins, clearance between twin tyres, and we have no less than 5 ft. 5 ins, occupied by the tyres, leaving only a space of 2 ft. 1 in. between the two inner tyres1 ft. 9 ins., if clearance be necessary—for the differential case and torque tube.
AN example of the care taken a packing motor lubricating oils is to 'be se.,. at the AngloAmerican Oil Co.'s depot at Purfleet, Essex, where a new electric plant has been installed for cleaning, repairing, painting and weighing 1,200 barrels per day. The used wooden barrels are steamed for 15-20 mjnutes and washed, first with caustic soda and then with hot water. They are then dried for 40 minutes by means of 90 hot-air driers, and sent on runways to the cooper for repair, subsequently being glued inside to make them oil-tight. The barrels then pass between revolving paint brushes and, after drying, are weighed on automatic scales, filled with oil and again weighed before passing, under their own momentum, along a quarter-mile runway, to be loaded ready for transport.
ONE of the troubles in connection with even firing in oil engines has been traced to the unequal lengths of piping between the fuel pump and the injectors. Inspection of the new A.E.C.-Acro design reveals that this difficulty has been overcome by mounting the pump midway along the engine and making the six pipes of equal length by suitable sweeps.