xxxiv Conditions relating to Machinery, 



9. If the encrine te worked on the expansive principle, it is desirable that 

 the means used for cuttin'^ off the steam be of a simple character. No force- 

 pump must be fitted with more than two valves, and these must be easy of 

 access. If a heater for water be used, it must be so constructed that the 

 engine will work with or withoiit it. 



10. The Society will be empowered to select any of the engines exhibited, 

 for tlie purpose of driving other machinery under trial, and will pay the 

 Exhibitor 11. a day for the use of the engine and a competent attendant, during 

 the time the services of such engine may be required. 



11. In adjudicating on the merits of the engine, reference will be had to the 

 simplicity of construction and the probable durability of the engine considered 

 as a whole and in detail, the portability of the engine, the strength required 

 for safety, the economy of working, and the price. 



12. The Judges will be instructed to have the boilers filled properly with 

 water, and a forcing pump applied, by which the boilers are to be tested up to 

 fully twice the working pressure ; a portion of the water will be then drawn 

 off, and the steam got up to the working pressure. The engine will be set to 

 work for a short time, and then cooled down. 



13. The Exhibitor will then be required to take the engine to pieces in the 

 presence of the Judges, and withdraw tlie piston, slide, eximnsion-valve, and 

 pump-valves for examination. When the whole is put together, the engine 

 will undergo the trial of working in the ordinary manner, and in accordance 

 with the practice of former meetings, with the assigned pressure. 



Chaff Cutters and Mills. 



Chaff cutters will be required to cut chaff three-eighths of one inch in length 

 in the trial. The Exhibitor must provide means for cutting various lengths, 

 to show the usefulness of his production. The Judges will be instructed to 

 p.ay attention to the length of chaff cut ; and if the deviation from the given 

 length of three-eighths of an inch is, in their judgment, too much dejiarted 

 from, they may refrain from taking any notice of the machine in question ; 

 and in estimating the weight of chaff cut, allowance must be made and taken 

 according to length of chaff cut. 



Grinding mills will be fairly set to work, and their production compared 

 with a sample which the Judges shall cause to be produced by one mill, and 

 which pro luce shall, in their estimation, be adapted for the farmer's purposes 

 of feeding. The mill under trial shall be "set" until it produces like meal; 

 and the time, poiver, and quantity of work be noted. 



Metal mills for grinding will not be expected to produce " softened " meal, 

 although any mill in combination, with rollers or otherwise, which will do so, 

 Avill receive consideration from the Judges. 



Speed and Pressure. 



All implements turned by a winch 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 14-inch crank, 32 revolutions for IG-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 4 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 32^ revolutions per minute. 



