Report on the Trials of Implements at Wolverhampton. 475 
On tlie 31st of May, Messrs. Eastons, Amos, and Anderson, tlic Society's 
Consulting Engineers, issued, for the guidance of exhibitors, the following 
" General Instructions. 
" 1. There will he no restrictions on the construction of the Steam Engines 
or Boilers, nor any limits to tlie pressure of steam used, subject always to 
Clause 3 of the General Conditions. 
" 2. Each Boiler must be; provided with at least two safety-valves, two sets 
of gauges for ascertaining the water level, a steam-pressure gauge, and a half- 
inch cock, terminating in a half-inch male gas thread for the purpose of 
receiving the pijie of the Society's testing-pump. 
" 3. Each Boiler will be subjected to a hydraulic test of double the pressure at 
which it is intended to work, and ilie E.xhibitors must be prepared to produce 
working drawings of the Boilers, to illustrate the construction of any inac- 
cessible part, or to enable the Engineers, in case of doubt, to satisfy themselves 
of the safety of the Boilers by calculation. 
" 4. Each Engine will have to be taken to pieces, to enable the Judges 
to examine all its working parts, and the Exhibitors are required to provide 
the necessary tools and tackle for the purpose. 
"5. The merits of the Machinery in Classes I., II., III., and Lord Vernon's 
prize, will be determined by the weight of earth moved per hour, the depth 
of cultivation, the goodness of design and workmanship, the economy of fuel, 
water, oil, attendance, and the price of the apparatus. Indicator diagrams 
will be taken from the cylinders during the trials. 
"6. All the Machines in Class 111. will be tried by one and the same 
ordinary portable Engine, which the Society assume the right to hire from any 
of the Exhibitors, at a charge not exceeding 11. per daj-, and such Engine will 
be driven during the trials by a driver appointed by the Society's Engineers. 
"7. The Implements and Machines in Classes IV. to XVI., both included, 
will be tested by the Ploughing Engines entered for trial, the Society assuming 
the right to select such as it may require, on payment of a sum not exceeding 
3?. per day, including the necessary stores and attendance. The merits of the 
implements will be determined with reference to the weight of land moved 
per hour, the depth of cultivation, quality of design and workmanship, 
economy of attendance, and price. The traction dynamometers will not be 
used, except att he discretion of the Judges, to assist in deciding between imple- 
ments of very equal merit. Classes IV. and V. will not be tested in any way, 
hut will be judged with reference to design, workmanship, and price. 
" 8. The nature of the tests and trials to be applied to Classes XV. and 
XVI. will be decided by the Judges, on inspection of the machinery brought 
for exhibition. 
" 9. The trials of Class XVII. will be of two kinds — firstlj', for the purpose 
of ascertaining the merits of the Engines for ordinary farm purjwses ; and, 
secondly, for determining their efSciency as Traction-Engines. In the first 
series, the usual break dynamometer will be employed, and the merits of the 
Engines will be decided with reference to the power developed, the economy 
of coal, water, oil, the price and merits of design, and workmanshij). There 
will be no restriction as to the power to be developed on the break, but each 
Exhibitor must specify the pressure of steam, number of revolutions, and 
horse-power on the break at which he wishes his Engine to be tested. Indi- 
cator diagrams will be taken during the trials on the break. The second 
series will be conducted over a course of some four of five miles in length, and 
selected with the view to the greatest possible variety of surface, such as hard 
road, fields, level and hilly, wet and dry. A train, composed of waggons, to 
be procured by the Society, will be made up, and loaded in any manner and 
to any extent the Exhibitor may determine. He will then state the quantity 
