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[Page 68]
The Chimney is fifteen Inches in diameter at the upper Part of it which is fifteen feet high above the Rail Road.
The twenty five Copper Tubes present a fire surface of 117¾ Square Feet, if to this is added the 18 feet, the fire surface of the small Boiler, it will give (18 + 117¾) 135¾ Square feet of Surface exposed to the Action of the Heat from the Fire and estimating this Engine as a ten Horse Power there will be (135.75/10) = 13½ Square feet fire Surface for each Horse Power.
The area of the 25 Copper Tubes of 3 Inches
[Page 69]
diameter is just equal to the Area of the 15 In Chimney, by this Means there will be an equally rapid Current through the Copper Tubes as up the Chimney.
The diameter of the Steam Cylinder of the Rocket being 8 Inches the Area will be 50.25 Square Inches and the length of the Stroke being 16.5 Inches then 50.25 x 16.5 = 829.128 Cubic Inches of Steam of each Cylinder full of Steam, but as there is a space for clear both top and Bottom of about ¾ of an Inch each end and the Steam that must fill up the Passages and Side pipe – this will require about 1/8th more than the Quantity Calculated from the Length of the Stroke and the Area of the Cylinder therefore
