Trials of Traction- Engines at Wolverhampton. 543 
handles of which extend forwnrd of the smoke-box, so as to be within reach of 
the steersman (who, in the case of this engine, is in front, and has nothing to 
do with tlio firing or stopping and starting of the engine). These tooth- 
wheels work two pitched cliains, made of wrought iron, case-hardened, with 
■J-inch steel pins, which take directly on to other tooth-wheels attached to the 
inner side of the driving-wheels. These driving-wheels are 5 feet 6 inches 
diameter, 14 inches wide, and have cast-iron tyres, on which are riveted 
bands placed angleways. The wheels are provided with holes to take iron 
]>addles or wood blocks, eight on each wdiecl. The main axle is carried in two 
cast brackets, bolted on to the sides of the fire-box, across the front of which 
the axle passes. Each of these brackets contains a volute spring, on which the 
engine is supported. The steering-wheels have cast-iron rims with pro- 
jecting ribs, and a wrought-iron axle below a cast-iron bed, on which is a 
semicircle taking the steering-chain. This is a flat-link chain, passing over 
a toothed pulley at the bottom of the upright steering-spindle; this spindle-is 
carried in a column, and is surmounted by a worm-wheel driven by a worm- 
pinion on the hand-wheel shaft. The feed-pump is immediately below the 
left-hand end of the crank-shaft, and is worked by a separate eccentric. The 
regulation of the feed is made by a cock in the suction-pipe ; the handle of 
this cock, and that of the ashpan-dampcr, the rcversing-handle, and the steam- 
handle, arc all brought within reach of the fireman, who stands in a portion 
partitioned off the coal-box, which is carried on the main traction-iron. This 
engine is not fitted with a brake. The water, 160 gallons, is contained in a 
tank suspended below the barrel of the boiler. The water is not heated by 
the waste steam, although a little condensation from tlie waste steam gets into 
the' tank. There is a heating-pipe from the boiler to blow into the tank when 
the steam is high. This engine consumed 5'02 lbs. of coal per horse-power 
jier hour, and evaporated 7'36 lbs. of water per 1 lb. of coal, and consumed 
1 lb. 2 ozs. of oil, being at the rate of 4 ozs. per horse-power per day of 10 
hours. 
The indicator diagrams, of which the figure below is a copy, show that 
Fig. 8. — Indicator Diagram of Me-isrs. Biirrell's 8-Horse-potoer 
Locomotive, No. 3660. 
19'15 gross indicated horse-power were obtained by a consumption of 4'19 lbs. 
of coal jicr gross indicated horse-power per hour. It will be seen, on an 
examination of these diagrams, that the slide was not well set, and that much 
more power was developed at the crank end than at the back end of the 
cylinder. 
