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Alley and MacLellan, Limited.

7th March 1907, Page 13
7th March 1907
Page 13
Page 13, 7th March 1907 — Alley and MacLellan, Limited.
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Which of the following most accurately describes the problem?

Exhibit:—One 6-ton Wagon: one Chassis.

This steam vehicle departs from the general practice of manufacturers, in as much as the engine is not compounded. The usual gear-box is absent, and the drive is by a single roller chain : one of the sprockets is upon the right-hand end of the crankshaft; the other is bolted to the differential caging. The engine is horizontal, and has two double-acting cylinders, each 61 inches in bore, and a piston-stroke of to inches. It is rated at 25b.h.p., but this can be increased, for short periods, to as much as 75b.h.p. The crankshaft is a steel forging 3 inches in diameter after machining, and, owing to.,there being no need for the usual eccentrics, it is short and exceedingly " stiff."

Mushroom valves are used to control the steam which passes into the cylinders. These valves are placed longitudinally beneath the cylinders in four pairs—one pair of exhaust and one pair of inlet for each cylinder—the valvesstems being towards the centre of the cylinders. The necessary reciprocating action of the valves is obtained from a short transverse camshaft, which lies between the eight valve stems. Rollers are fitted to these stems, and the camshaft revolves in a bath of off.

The camshaft is actuated by the following means :—A bevel gear-wheel is keyed to the crankshaft, and this drives another bevel wheel which is fixed immovably upon a longitudinal shaft running parallel with, and outside, the cylinders. A second pair of bevel wheels, one on the longitudinal shaft and the other on the camshaft, completes the train. The cut-off can be altered, by a hand lever at the driver's right, to 4, 4, or I, at will : the action is brought about by sliding the camshaft longitudinally in its bearings, which movement is allowed for in at taching the bevel wheel to the camshaft by a key; this permits the shaft to slide to or fro without altaingthe correct angularity.

The boiler consists essentially of a cylindrical shell, and a square central member, from the top of which inner portion rises a circular flue. The square portion contains forty-eight watertubes, half of which are placed at right angles to the others ; the tubes lie at a small angle from the horizontal. The central flue contains a long, steel, super-heating coil, the area of which is sufficient to raise the temperature of the saturated steam issuing from the boiler, to the extent of about 175 degrees Fahrenheit, before it passes to the cylinders. The total heating surface is 61.3 square feet, whilst the gratearea is 3.6 square feet.

Another featur.! of the SAttini.1 wagoa is the foot control. Referring to the sectional diagram, one complete revolution of the lever at tht. top, opens the steam valve to its fullest extent. The steam can then pass through the upper steam port, and outwards from the lower one to the engine. When it is necessary to stop the enzine, the footpedal can be depressed, and this doses the second valve against its seating, thereby shutting off the live steam : the upward movement of this valve also uncovers a port which is connected with the exhaust, and thus allows the steam in the cylinders to pass to the atmosphere. After the hand lever has been turned to any required position, the subsequent control is entirely carried out by the foot pedal. The framework is constructed of steet channels, and transverse stays, which are connected together by steel bolts, and patent washers. Front and back axles are steel forgings, and the fourna4s are ground up after turning. The company's patented farm of composite wheel is fitted, and the construction of this allows any stretch in the tire to be easily taken up, and, at the same time, permits a new tire to be expeditiously replaced if necessary. This de

sign is the result of practical tests made over a long period. The centre of the wheel is of cast steel, whilst the felly is of wood. The outer edge of the central member and the inner face of the felly are tapered, and a ring is inserted between the two faces. The action of drawing the ring inwards, which is done by screwing up a series of bolts, forces the felly outwards and so takes up any slackness in the tire Thedetails of the front wheels differ slightly from those of the back ones. There are, also, a number of separate parts on the stand, and it should be noted that the company's address is Sentinel Works, Polmadie, Glasgow, whilst its London representatives are Messrs. E. IV. Rudd and Co., 26, Page Street, Westminster.

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Locations: Glasgow, London

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