Hayden's "Patent Boiler," though nut particularly artistic in appear- ance,
is nevertheless an ingenious contrivance for boiling water in large or small quantities, in a very short apace of time, and at little cost. The apparatus consists of two tin vessels, a large and a small one ; the large vessel being capable of holding from twenty to thirty gallons of water, the small one from two to three gallons. The lesser vessel is round in form, about two feet high, and eighteen inches in diameter, at the bottom, but smaller at the top. It has an inner and an outer case, about an inch apart at the top, and two inches or more at the bottom, soldered to- gether, so as to admit and hold water. This tube-like apparatus is further provided with a worm in its centre, through which the water passs into the case, and also a stand and grating. The coals for heating the water are placed on the grating, and around the worm, and in the centre of the case ; a large heating surface is thus presented to the fire. The smoke is conveyed away by means of a small pipe attached to the top of the small vessel; and it can be conducted into the fireplace of-the room in which the apparatus is used. The larger vessel is oblong in form, about two feet six inches in length, and twenty inches wide in its centre ; the bottom of which is on a level with the top of the smaller vessel. It is also provided with a cover to keep the steam in. It stands on three legs, and is connected with the smaller vessel by a small pipe, through -which the water passes. The hot water is drawn off by a tap placed at the bottom of the small vessel or at the top. Mr. J'udkins, the proprietor, informs us that the water in the small vessel can be boiled in two or three minutes, and the whole in both in about fifteen minutes, and kept boiling all the day, by a pennyworth of coals.
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