Prizes for Implements and Machineri/. lix 



11. per day for the utse of the engine and a competent attendant during tlie 

 time the services of such engine may be required. 



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

 simplicity of construction and the probable durabilitj- of the engine, considered 

 as a whole and in detail, also the portability of the engine, without losing sight 

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



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

 water, the steam got up to the working pressure of 45 lbs. on the square inch, 

 the engine set to work for a short time, and then cooled down. 



9. The exhibitor will then be required to take the engine to pieces in tlie 

 presence of the Judges, and withdraw the piston, slide expansion valve, and 

 pump valves, for examination. Two men will only be allowed to assist in the 

 ojieration, and the time of taking to ])iecesand replacing the parts will be noted. 

 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. 

 If after trial the Judges should require any one or more of the tubes withdrawn 

 for examination, the exhibitor shall withdraw such tube or tubes. 



(2). Fixed Steam-exgixes. 



1. The fixed steam-engine must not be more than ten horses nominal power, 

 and the diameter of the cylinder must not exceed llj inches. 



2. The exhibitor will not be required to bring a boiler, as steam will lie 

 furnished by boilers supplied by the Society, but he will be required to fix the 

 t-'Ugine, also to find the materials for doing so, at his own expense, and in such 

 a position in the Trial Yard as may be pointed out to him. 



3. He must also furnish the Society with plans and specifications, fully 

 describing the boiler and fittings that he would supply to his customer with 

 the engine he exhibits, such boiler to possess the capacity of 25 superficial feet 

 of effective heating surface, and | of one foot of effective fire-grate for each 

 horse-power of the nominal power of the engine. Xo tubes will be allowed of 

 less diameter than 2^ inches, nor thinner than Xo. 12 on the metal gauge. 

 Also the leading particulars of the engine he intends to exhibit ; such as — 



(a) The horse-j)Ower of the engine. 

 (6) The diameter of the cylinder, 

 (c) The length of stroke. 

 (cZ) The number of strokes per minute. 



(e) The diameter of crank -shaft. 



(f) The diameter and weight of fly-wheel. 



{[/) The diameter of dri^dng pulley (which should not be less than 7 inches 

 wide, nor travel less than 1200 feet per minute). 



The greatest attention will be paid by the Mechanical Judges to the draw- 

 ings and specifications relating to the boilers of tlie Prize Fixed 

 Engines. Such drawings and specifications will remain the copjTight 

 property of the Society ; and will be published in the Journal of the 

 Society for the purpose of guiding its members in making their 

 purchases. 



4. The engine exhibited must be su]>plied with a governor, and have a start- 

 ing-cock to regulate the supply of steam, and be fitted with a thread etpial to 

 the 2-inch gas pipe. 



5. If the engine is worked on the expansive principle, a simple means must 

 be used for cutting off the steam. Xo 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 either with or with- 

 out it. 



6. In adjudicating on the merits of the fixed engines, reference Avill be had to 

 the price, simplicity of construction, probable durability of the whole and in 



VOL. XVIII. ^ 



