52. Q. How many cylinders have the cross-compound compressor?
A. Four; two steam cylinders and two air cylinders.
53. Q. What is the diameter of the different cylinders?
A. The high pressure steam cylinder is 8½ inches; the low pressure steam cylinder 14½ inches; the low pressure air cylinder 14½ inches; high pressure air cylinder 9 inches.
54. Q. Explain the valve gear of this compressor.
A. The valve gear is the same as that of the 9½ or 11 inch compressor, only that a piston valve is used to distribute the steam instead of a slide valve.
55. Q. Where does the steam come from that is used in the high pressure steam cylinder?
A. Direct from the boiler.
56. Q. Where does the steam come from that is used in the low pressure steam cylinder?
A. The steam after doing work in the high pressure steam cylinder is exhausted into the low pressure steam cylinder, where it becomes the working pressure of this cylinder.