The Darwen Automobile Agency.
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Exhibit :—One Chassis, and One Engine.
The American motor manufacturer has always been keen on air-cooling for internal-combustion engines, and there can be no doubt that engine designers in that country have given far more attention to the subject than has been devoted to it by English engineers, One of the most efficient of these American air-cooled motors is the Frayer-Miller, which has separate cylinders, each of which is provided with a large number of short cast-iron studs, or projections,and these are surrounded by sheet-metal jackets. At the forward end of the engine, there is a geared centrifugal fan, the impellers of which cause a strong current of air to be fed into the top of each .of the cylinder jackets, and the air, in passing to the discharge orifice at the bottom of the jackets, must circulate amongst the numerous radiating studs, and those reduce the ten-}perature of the cylinder walls. There is much to be said in favour of such a scheme of cooling, chiefly on account of the entire absence of all radiators, water pumps, and the pipe connections which are inseparable from a water-cooling system. This vehicle was recently put to an extensive test in England, and made average runs of 64 miles a day from London, to such places as Luton, Aylesbury, Darlington, Sutton Coldfield, and other towns; its average speed worked out at to miles an hour, whilst the agents inform us that the petrol consumption, during those trials, averaged one gallon for each 1312, miles. The chassis exhibited is fitted with a 24h.p. engine (R.A.C. rating 26h.p.), and is intended for loads of two to 2,1 tons. In addition to the chassis, a 5oh.p. engine, built on precisely the same lines as the 24h.p., is shown by this company, and the sketch which we reproduce herewith shows, in outline, the arrangement of the air ducts from the centrifugal fan to each of the cylinders. The Darwen Automobile Agency, of 38, Featherstone 'Street, City 'Road, E.C., is the sole agent for these engines and vehicles in this country.