266 



ARRANGEMENTS OF THE " ROCKET.' 



CHAP. XII I. 



" Rocket " chimney, and turned up within it, were con- 

 tracted slightly below the area of the steam-ports ; and 

 before the engine left the factory, the water rose in the 

 glass tube three inches above the water in the bucket. 



The other arrangements of the " Rocket " were briefly 



these : the boiler was cylindrical with flat ends, six feet 



in length, and three feet four inches in diameter. The 



upper half of the boiler was used as a reservoir for the 



p.stearn, the lower half being filled with water. Through 



I the lower part, twenty-five copper tubes of three inches 



diameter extended, which were open to the fire-box at 

 one end, and to the chimney at the other. The fire- 

 box, or furnace, two feet wide and three feet high, was 

 attached immediately behind the boiler, and was also 

 surrounded with water. The cylinders of the engine 

 were placed on each side of the boiler, in an oblique 

 position, one end being nearly level with the top of the 

 boiler at its after end, and the other pointing towards 



