Conditions relating to Machinery. 
CONDITIONS EELATING TO MACHINERY. 
Steam-Engin£s. 
All engines must be fitted with a steam-indicator, in addition to the ordinary 
spring-balance. 
1. The implements for steam cultivation will be tested by dynamometer, 
if possible, and such experiments made as will enable the Judges to ascertain 
the relative value in usefulness of such implement. 
2. The steam boiler of each engine must be provided with a pijie or tube, 
the thread of which must be equal to the " half-inch gas-pipe thread," for the 
purpose of attaching a forcing pump ; and each boiler will be tested to any 
pressure the exhibitor thinks fit ; but a pressure not exceeding one-half the 
" test " pressure, is the utmost that will be allowed at any time during the 
whole time the steam is up for the Judges' purpose. 
3. Any engine which is entered for competition, or for working in the yard 
of " machinery-in-motion," which, from defect in construction, or any other 
cause, is, in the opinion of the Judges and Consulting Engineer, "unsafe," 
shall not be allowed to work on the Society's premises ; and further, the 
word " unsafe " shall be attached to the engine during the remainder of the 
exhibition. 
4. The brick and tile machines will be tested by a dynamometer, where 
practicable ; and machines intended to be worked by steam powei', must be 
provided with proper riggers, pulleys, or drums, for the application of power 
to the machines. Those machines intended to be worked by hand-power, 
must be provided with a pulley not less than 4 inches wide ; and such puUej* 
or rigger must not be less in radius than the radius of the crank which is 
sent with the machine, and by which it is usually worked. 
5. Every exhibitor of pipe-machines will be expected to bring a die, 
2f inches diameter, with the "button" or "triplet" 2 mches diameter; and 
the machine must cut the pipes to the length of 2i inches : also other dies, 
with triplets, for pipes varying from 1 to 4 inches diameter, or for longer 
liipes, if the machine is capable of making them. 
