Herewith is a sketch of an apparatus that will boil 5 gal. of water in a tank fixed 12ft. from the fire. The tank should be made with an open top and be covered with a loose lid. If the tank is tightly closed at the top, a hole must be made or a pipe inserted in the covering for the escape of steam. In the illustration a four-pipe coil is shown in the fire, but if hot water is not required at a short notice two pipes will do - that is, the middle bend in the coil may be omitted. If the fire is moderately thick from front to back, the four-pipe coil will probably boil the 5 gal. of water in thirty minutes. A thin fire will be of little use in any case, as the comparatively cold coil will keep the fire dead. The pipes may be | in. in diameter, but 1 in. will be better. The coil is only suitable for soft water. If the water is hard, a small boiler must be used instead of a coil, as the latter would quickly become choked with lime deposit. The boiler should be provided with a man-lid so that the deposit may be regularly removed. The tank can be supplied with cold water by a tap over the top or by a pipe connection in the side or bottom; this pipe should be fitted with a stopcock. It is essential that the pipes should have a rise from the coil to the tank of not less than l in. in 5 ft.

The more the pipes rise the better.

Apparatus for Boiling Water in a 5-gal. Tank.