ON RAILWAY CONSTANTS. 



233 



tons. cwt. qrs. tons. cwt. qrs. 



Brought forward 32 



Carriages, No. 29, 5 



Do. 9, 5 



Do. 12, 5 



Do. 20, 5 



Do. 22, 5 



Do. 35, 5 



Do. 31, 5 0, 



Do. 5, 5 



Do. 23, 5 



Do. (open) 7, 5 50 



Gross weight of Train ... 82 



Dimensions of the Hecla. 



ft. in. 



Diameter of Driving Wheels 5 Q 



Diameter of Cylinder 121 



Length of Stroke 18 



Diameter of Blast-pipe 2J 



Internal Dimensions of Firebox. 



Width crosswise 3 6i- 



Length lengthwise 2 4^ 



Depth from underside of roof to top of Grate Bars 3 4I 

 Number of Tubes 117. 



Length of Tubes 8 65 



External diameter 1# 



Heating surface per lineal foot . . . -375 sq. feet. 

 Heating surface of Firebox .... 45-38 do. 

 Heating surface of Tubes 373'7 do. 



Total heatinsr surface 



419-08 



do. 



" Hecla," Tender and Twelve Carriages. 

 From Liverpool to Birmingham. 



