On Heating Pineries and Piiie- Pits. 
101 
square, is for the purpose of containing steam, c, is a brass funnel, 
fixed to a pipe that reaches about six inches from the bottom of the 
boiler, as D, so that in feeding the boiler, no heat esca})es at the time ; 
E, is a large sized ale-tap, fixed to the neck of the feeding pi]>e, close 
under the funnel, in order to confine any heat or steam that might es- 
cape, so that it is only opened for the time the boiler is feeding. 
The hot-water pipes, F, G, are four inches in diameter ; the top pipe, 
F, is fixed seven inches below the top square of the boiler, as H ; at 
the face of the boiler, in the back-shed, I have a small ale tap fixed 
exactly opposite to the centre of the pipe F, as at i, in order to ascer- 
tain when the boiler is sufficiently full ; so that when the top pipe, F, 
is half fiill of water, the water begins to drop from the tap, i, which 
is the desired quantity ; for if the pipe was to be filled, it would not act 
so beneficially. These pipes go round the house at four inches from 
the walls, and return into the boiler agreeably to the regular mode of 
conducthig hot-water pipes, The top pipe is fixed nearly level, but 
he lower one falls to the boiler, about one inch per yard, in order to 
give force to the returning water. 
