CATALOGUE OF THE MECHANICAL ENGINEERING COLLECTION. 73 



Attached to the head of each cylinder was an iron frame consisting 

 of two upright posts so placed that the piston end of the beam would 

 pass between them and permit the end of the beam to pass clear of it. 

 The height of these frames was on a level with the head of the piston 

 rod when at half stroke. These frames were firmly braced so as to 

 hold them perfectly in place. 



In the center of each walking beam a journal projected on each 

 side to which two radius rods were attached, the other end of such 

 rods being attached by journals to the head of the posts of the up- 

 right iron frames in such positions that their journals would be ex- 

 actly in line with the piston-rod journal when the piston was at half 

 stroke. By this arrangement the head of the piston rod was at all 

 times kept in line with the center line of the cylinder. 



The valves regulating the passage of steam into and out of the 

 cylinders were operated by rods and cranks connected with eccentrics 

 on the rear axles, the angle of the eccentrics being such that when 

 one piston was at full stroke the other would be at half stroke. 



The journals for connecting the crank rods with the walking beams 

 were placed at a distance of 18 inches (one-fourth the length of the 

 beam) from the piston-rod journal, thus mailing the diameter of the 

 crank sweep equal to three-fourths of the stroke of the piston. Crank 

 rods extended from these journals to the crank pins in the rear wheels 

 and these, by horizontal connecting rods, were made to turn the for- 

 ward wheels. 



The exhausted steam was discharged from the cylinders into two 

 pipes 2^ inches in diameter, one being attached to each cylinder and 

 extending downward into the small Avater holder under the boiler, 

 thus utilizing the heat of such exhausted steam in partially heating 

 the water for supplying the boiler. From this small water holder 

 one pipe extended forward under the boiler and upward across its 

 front end, where it discharged into the chimney. 



The engine was provided with two safety valves, one of which was 

 placed back of the center of the boiler where the engineer could have 

 ready access to it and the other was placed very near to and in the 

 rear of the chimney and was so covered by a dome as not to be easily 

 accessible. The reason for such arrangement may be inferred from 

 one of the conditions contained in the offer by the Liverpool and 

 Manchester Railway managers in 1829 of a £500 prize for the best 

 locomotive for passenger trains, namely, " The boiler must have two 

 safety valves, neither of which must be fastened down, and one of 

 them completely out of control of the engineer." 



The " Stourbridge Lion " was built by Foster, Eastrick & Co., in 

 Stourbridge, England, a manufacturing town on the River Stour, 

 about 15 miles west of Birmingham. It was manufactured especially 

 for the Delaware & Hudson Canal Co. by order of Mr. John B. 



