EXPLANATION OF THE PLATES. 
399 
Diameter of Cylinder, in inches. Diameter of Piston-rod in inches. 
7 
1*04 
8 
1.2 
9 
1-34 
10 
1*5 
11 
1-64 
12 
1*8 
13 
1-94 
14 
2T 
16 
• 
2-375 
For more detailed information on this important subject, see description of Plates 
LXXXIX—XCII. 
PLATE LXVIII. 
This Plate represents a plan and section of boiler seating, for a twenty horse en 
gine, at the manufactory of Messrs. Whitworth and Co., Manchester. 
PLATE LXIX. 
This Plate represents Messrs. Hague’s double acting cylinder, with slides, &c. 
Fig. 1 is the cylinder, showing the facings for slide ; A is the passage to the top; 
B the passage to the bottom; and C the exhausting passage. 
Fig. 2 is a section of the cylinder and slide in the position for letting in the steam 
at the top A, and exhausting at the bottom through B C; D is the slide with the 
exhausting passage through it; F is a spring to keep the slide to its face; and G 
the steam pipe from the boilers. 
Fig. 3 shows the facings of the slide. 
Fig. 4 shows the side of ditto.