62 



L. HARGRAVE. 



. 



Fig. 3. 



is contained in the square part of the tubular frame, and the 

 kerosene in the centre upright part. The cylinders (2) are 4*25 

 inches diameter, the stroke is one inch, and they rotate with 

 the screw. The shaft is clamped to the frame. The boiler is 

 made of one hundred and twenty-four feet six inches of - x -e inch 

 copper pipe, with 10-27 square feet outside heating surface ; the 

 capacity is 88-4 cubic inches. Weight of pipe is 8*37 lbs., coiled 

 eight and a half inches outside diameter. The upper two-thirds 



