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Garrett.

22nd November 1927, Page 146
22nd November 1927
Page 146
Page 146, 22nd November 1927 — Garrett.
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ONLY two vehicles are exhibited on this stand, onea 55-Passenger double-deck six-wheeled electric trolleybus and the other an improved rigid hawheeled undertype steam wagon suitable for carrying loads up to 10 tons.

Interest in the trolley-bus centres chiefly in the bodywork, as this is now manufactured almost entirely of steel (filled in with wood only where necessary for fitting accessories) in order to keep the weight as low as possible, compatible with adequate strength.

The chassis is laid out on straight

forward lines and includes . in the specification a "Bull " single 60 h.P. motor arranged with series-parallel con• trot, bridge transition and shunt-field top speed. The commutator is claimed to be absolutely sparkless at. any load up to 250 avails., with 33 per cent, field diversiorl.

Ten forward speeds and -reverse are provided by a Garrett controller with shunt-field controlling gear and a special device which enables the controller to ;return to the" off " position as soon as the brakes are released.

The two rear , axles are driven in tandem by a counter propeller shaft.

Suspension is by two inverted semi., elliptic springs, working in conjunction with radius rods, the pivot a the springs lying in a horizontal line with the centres of the rear wheels.

With a Westinghouse air brake

equipment, quite remarkable stopping distances have been achieved, comb'ned with a light pedal action. The body accommodates 28 passengers in the lower saloon and 27 passengers in the upper saloon. In passing it might., be mentioned that the whole of the framework and panelling is in steel, mostly

spot-welded together in codiplete sections, flitch plates being fitted where necessary in order to obtain transverse and longitudinal strength. The price of the vehicle is £1,915. •

The steam vehicle shown is the familiar Garrett undertype rigid sixwheeler, which is now fitted with a modified engine. Actually the chief alteration consists in fitting ponnet-tYPe . valves, instead of valves of •the piston type, which, apart from increasing the ,power slightly, has made the engine more foolproof in the hands of inexperienced drivers. In addition the cab arrangement has been entirely reorganized, providing the driver with a greatly enhanced view forward and -providing increased bunker accommodation. With a platform body 19 ft. 6 ins. by 7 ft with 24 ft 2 ins, hinged sided and tailboard, the price of the vehicle as Shown is f1,550.

The engine is made up of four sections, the two cylinders lying sideby side with the valves inclined . at 90 degrees to each other and operated from a camshaft running longitudinally beneath the centre line of the unit. The other three sections consist of a crankcase and two intermediate castings, the forward one of which contains stuffing boxes, and the rear one forming the cross-head guide. Incidentally, two stuffing boxes are used, for each of the piston rods, the idea being to avoid any molecules of water being transferred from the cylinders along the piston rods, into the cross-heads, and thence to the crankcase. Actually no part of the piston rods, which are in contact with the steam, pass 'beyond the second gland.

This vehicle has a turning circle, of 26 ft"radius. Its unheaped Carrying caPacitY is 224 cubic feet.

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