147 The boiler on the sitie of the fire not only serves to keep up a supply' of hot water, but is likewise a defence to the cook in handling the pots'and kettles from the side. Although the chimney, while wood was used in it as fuel, often failed to carry off the smoke, there has been no inconvenience arising from that cause since the plan above described was resorted to. Contrary to expectation, the chimney draws well at all times~ without elos. !ng the ~h~or. In the association of the

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... nt boiler with the grat% it isuot pretended that there is any thing new. In Dr. Hare~skitche%water is supplied by a cock terminating a hydrant pipe; but the contrivance called the bali cock wouhl be preIerable; and it wouhl be still more advantageous to have a cylindrical water-tight vessel capable of bearing the pressure o[ the water t~om the wa{er works, agreeably to the plan pursued by Messrs. Morris, Tasker and Mur,'is. By a boiler of that kind a constant supply of hot water is had without the trouble of replenishing the containing vessel. It is important that the back grate should be very stout; it shouht form a large mass of metal, for its c.wn protection in the firstplace; and in the second, in order that it may, by the conducting process, t~'ansfer heat from the fire to the plate resting upon it at the fi'ont edge. :By these means it proves a reserwfir of caloric, and serves to detain and render it more useful. The weight of the grate employed is eighty-four pounds.