Conditions relating to Machinery. xxxiii 



CONDITIONS KELATING TO MACHINERY. 



Steam-Engines. 



All engines must be fitted with a steam-indicator, in addition to the ordinary 

 spring-balance. The actual power used during the respective trials will be 

 correctly ascertained. 



Fixed Steam-Engines. 



1. The fixed steam-engine must not be more than 10-horse nominal power, 

 and the diameter of the cylinder must not exceed II5 (that is, eleven and 

 a-half) inches. 



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

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

 the engine, also to find the material for doing so, at his own expense, and in 

 such a position in the Trial- Yard as may be pointed out to him by the 

 Director. 



3. The engine exhibited must be supplied Avith a governor, and have a 

 starting-cock to regulate the supply of steam, and be fitted with a thread equal 

 to the 2-inch gas-pipe. 



4. In adjudicating on the merits of the fixed engines, reference will be had 

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

 in detail, and the means provided for easy access to the working parts, and to 

 economy of fuel. 



PortaUe Steam-Engines. 



5. The engine with two cylinders will be worked with steam at 80 lbs. to 

 the square inch, and the cylinders must not exceed 8^ inches, or be less than 



7 inches in diameter. The engine with one cylinder will be worked at 50 lbs. 

 to the square inch, and its cylinder must not exceed 10 inches, nor be less than 



8 inches in diameter. 



6. The engine with two cylinders will be calculated at 9 circular inches for 

 each horse-power, and loaded accordingly in the first experiment. A second 

 experiment will be made with each engine, when the load will be increased 

 50 per cent. The engine with one cylinder will be calculated at 10 circular 

 inches for each horse-power for the load in the first experiment, and 50 per 

 cent, will be added to the load in the second experiment. 



7. The tubes in the boiler must not be less than 2^ (that is, two and a-half) 

 inches in diameter (inside measure), nor less than No. 12 on the metal-guage 

 in thickness, nor placed a less distance apart than 1 inch from each other. 

 The tube-plates must be made of iron equal in quality to " Lowmoor " or 

 " Bowling " iron, and the trade-mark of the iron company must be legible on 

 each plate. 



8. The engine must be provided with a good water-guage, and with a short 

 piece of pipe fitted with a cock, having a thread to fit the lialf-inch gas-pipe, 

 for the purpose of fitting a pressure-guage. 



YOI.. ITT. — P. ?;. C 



