Col. Colt came to the conclusion that the hammer-revolving cylinder was the more useful article, inasmuch as it enabled the person using it to take a more steady aim than with the other, which, revolving and firing by the action of the trigger, the moment of explosion could not be depended upon.

A large cylinder will inevitably become oval if laid upon its side; and if while under the tension due to its own weight it be bored round, it will become oval again when set upon end.

Cylinders of locomotives should be large, proper arrangement of.

If a cylinder is 6 inches in diameter, 36 multiplied by .7854, gives the area in square inches.

The cylinders of this engine are each 14 inches diameter; the length of the stroke of the piston is 21 inches.