Conditions relating to Machinery. xxvii 
instructed to pay attention to the lcn<?th of cbaiT cut; and if tlio deviation 
from tlic given length of three-eighths of an incli is, in tlieir judgment, too 
much departed from, they may refrain taking any notice of the machine 
in question : and in estimating tlie weif/ht of chaff cut, allowance must 
be made and taken according to length of chaff cut. 
SPEED AND PRESSURE. 
All implements turned by a -vvinch or hand-crank shall not be worked at 
any trial beyond the following speed : namely, 42 revolutions per minute for 
12-inch crank, 37 revolutions for li-irich crank, 32 revolutions for 16-inch 
crank ; and, in addition to the winch-handle which must be supplied with 
the machine for the purpose of trial, a pulley not less than four inches wide, 
of the same radius as the winch, must be fitted to each machine. The 
machine in its trial will be driven by the pulley of the testing machine, 
which pulley is 31 inches diameter, and will make 32i revolutions per 
minute. 
Chaff-Cutting and other small machines, worked usually by horses or by 
steam power, will be Avorked, when under trial, by a pulley not less than 
5i (that is, five and a half) inches wide, moving with a velocity of about 
DOO feet per minute. 
Exhibitors are requested to j^ay particular attention to the instructions 
given for the speed and working of their machines, as the Judges may refuse 
to try any machines not fitted in accordance with these instructions. 
The working pressure of steam is not to exceed 50 lbs. per square inch. 
SPECIAL ARRANGEMENTS. 
1. The Judges will be instmcted to employ in the trial of the Steam- 
Engines as a test of power, an apjoaratus known as a Force-Register, such 
api^aratus consisting of a friction-break, to supply and regulate the friction 
required to balance the power of the engine under trial. 
2. At a distance of about thirty-four feet, or such other distance as the 
Society's Engineer may determine, a platform will be laid down, upon which 
the boiler of the Society may move in a direction perfectly parallel with the 
friction-break. 
3. Each fixed Engine must be placed in such a position by the Exhibitor 
as to require a Driving-Strap of such a length as the Society's Engineer may 
determine. 
4. Each Exhibitor must provide his own Driving-Strap, which shall be of 
the required length. 
5. Each fixed Engine, of more than four-horse power, will have attached 
to it a Steam-Pipe, the end of which must be at a given distance from the 
centre line of the Boiler Platform, and be provided with a union of such 
dimensions as the Engineer to the Society may determine, each being cut 
with the same screw : and it must be at a given height from the Boiler 
Platform. 
6. A short piece of flexible Pipe, capable of sustaining the temperature 
and pressure of fifty pounds of steam to the inch, for the jjurpose of forming 
a simple and ready communication between the Boiler and the Engines of 
juore than four-horse power, will be provided l)j^ the Society. 
