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Atkinson.

19th October 1920
Page 36
Page 36, 19th October 1920 — Atkinson.
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6 ton Platform Lorry.

STAND No. 102.

AAIONGST THE steam exhibits, one of the most interesting is certainly the six ton Atkinson wagon. The model shown is fitted with a platform body, and incorporates the new Atkinson Uni.flow engine, and a powerful footbrake of the internal-expanding type operating on drums bolted to the rear wheels. An engine, boiler, and front and rear axles are shown separately, so that visitors can examine minutely the design arid workmanship of these parts.

The Atkinson is of the undertype with a vertical boiler situated at the front. The tube-carrying portion of the boiler is made ija one piece, squared in a hydraulic press at the centre and with the clinker and fire holes pressed out; at the bottom it is flanged over and welded to the bottom portion of the outside shell. The top portion of the shell is then dropped over and joints made between it and the bottom half, and a cast boiler top, carrying the funnel, and the tube-carrying member. The tubes

are all expanded into position, and a tubular superheater is carried in the top portion. Both the boiler and engine are lagged with woven asbestos, which is covered with Wished sheet aluminium, secured into position on brass founclatioil rings by snap-headed brass. screws.

The design of the boiler presents many interesting features. The fire door as level with the footplate, and fuel to dropped through a manhole in the footplate instead of being put in at the top of the boiler, as in certain other types. The clinker door is also conveniently situated at the front, and the fire can be laid and lighted through this. The Uniflow engine has two cylinders of the double acting simple type, the inlet valves consisting of hardened steel bailsoperated by push rods and a camshaft. For the exhaust, the piston at each end of its travel uncovers an exhaust port at about the middle of the cylinder, and the same pert is utilized for exhausting steam at both sides of the piston, consequently the direction of the flow of steam is not altered. This engine gives a remarkable steam efficiency, the fuel consumption being at least 20 per cent. has than in the standard engine. No change speed gears are employed, the drive being taken straight" from a sprocket on the crankshaft through a heavy roller chain to the large chain wheel containing the differential gear pinions on the back axle.