476 Report on the Trials of Implements at Wolverhampton. 
of coal and water ho will require to take the load so prepared once ronnd the 
course, and tlie quantity he asks for will be placed ou board his Engine, 
no further supply being permitted during the run. Any fuel or water re- 
maining after the trial will be weighed or measured back. To assist the 
E.-chibitors in estimating the work to be done, a longitudinal section of the 
course will be prepared, and care will be taken to keep the average condition 
of it as nearly as possible the same for all the competing Engines. The 
figure of merit will depend upon the load drawn, the economy in fuel, water, 
oil, and attendance, price, and goodness of design and workmanshijx The 
distribution of weight upon the wheels will also be ascertained. 
" 10. The accompanying sheet, marked Form A, of Lithographs and In- 
structions, will explain the means which will be adopted, and the preparations 
the Exhibitors will have to make for taking indicator diagrams, measuring the 
water and oil, weighing the ashes, placing the Engines with reference to the break 
dynamometer, and adapting them to connect to it. 
"11. The Waggons in Class XVI II. will be tested by means of traction 
dynamometers. Each Exhibitor will be permitted to determine the load 
which his waggon is to carry, and the figure of merit will depend on the load, the 
tractive power required, the merit of design and workmanship, and the price." 
It is not necessary to reprint here the sheet of drawings upon Form A 
referred to. Fig. 1 showed the details and measurements for affixing the steam 
indicator; Fig. 2 was a section of the measuring tank to hold thirty gallons; 
Fig. 3 was a section of the Society's new break dynamometer, fitted witli 
three friction-pulleys, and driven by a coupling shaft with universal joints 
instead of by belt as heretofore; and Fig. 4 was an enlarged view, with 
dimensions of the clutch which each exhibitor would have to provide and key 
ujwn the crank-shaft of his engine. The letterpress of Form A will illustrate 
the care taken to be clear and definite in the 
" Instructions to Exhibitors. 
'^Indicator Diagrcms. — The Indicators u.sed will be supplied by the Society, 
and will be those known as Richards's, manufactured bj' Messrs. Elliott, Bros., 
449, Strand, London. The accompanying Illustration, Fig. 1, gives the 
lirincipal dimensions. The Indicator nmst be fixed as nearly as possible mid- 
way between the two ends of the cylinder, and connected to them by j-itich 
pipes well lagged and provided with cocks fitted with convenient handles, 
placed as near the cylinder ends as practicable. The motion of the paper 
cylinder must coincide with that of the piston, and be exactly proportional 
to it ; it will not therefore answer to work it from one of the slide-valve 
spindles or eccentric rods, but the motion of the piston itself must be reduced 
by levers, speed-pulleys, or other means. If the Engine has more than one 
cylinder, each one must be prejiared to receive an Indicator. The Exhibitor 
must provide the cocks, pipes, and means of communicating motion to the 
paper cylinder of the Indicator. 
'■^Measurement of Feed Water. — Figure 2 in the annexed Drawing represents 
the measuring vessel which will be provided by the Society. Each Engine 
must be adapted to receive such a vessel, and it must be fixed in some convenient 
)30sition, so that the l^-inch cock A may discharge either direct into the 
filling hopper of the tank or into a temporary funnel fitted up for the purpose, 
the bib of the cock being left visible, so that it may be known at once when 
all the water has run out. The water tanks of the Engines must be fitted 
•with cocks by which all the water in them may readily be drawn off into 
a measuring vessel, similar to the one represented in Fig. 2. 
" Meaauremeyit of the Ashes. — In order to ascertain as accurately as possible 
the weight of fuel used, means must be provided for readily raking out the 
fires without first slaking them yriVo. water, and transferring the hot ashes to 
