alogous to that of a rocking-chair the water in the hydrant chamber or a small rocking-horse, to which acts on the piston to held the same the rolling motion of a ship may be in its lowest position. If it is de- roughly compared. In construct- sired to use the hydrant, the piston ing a… … motion of the chair will, in such a to Metcalf. The old “baby gage” ~~ case, be similar to the rolling of was considered quite an engineer- * ships on waves, since it happens ing feat in its time, and justly, too, that the element on which the ship because it was built at a distance BY WAVES. is…
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