THE PRESERVING OF TIMBER FOR ESTATE PURPOSES. 85 
only a moderate sum. This apparatus is designed to be worked in 
connection with an estate saw-mill, or by a farm steam-engine of 
8 to 10 horse-power, which is quite sufficient for the purpose. 
The receiver (Fig. 1) is 5 feet 6 inches in diameter for 14 feet of 
its length, the total length over the egg-shaped ends being 19 feet 
8 inches, so that, in the central portion, it would take in timber 
nearly 19 feet long. The shel] should be built of riveted steel 
plates, the door joint being fermed by two heavy cast-iron rings 
securely riveted to the barrel and the egg-shaped end respectively, 
a projecting fillet on the face of the one ring fitting into a groove 
in the face of the other, and, being properly packed, they form a 
perfectly tight joint. When the door is closed, these rings are 
drawn tight up by eighteen steel bolts, with an eye in the end, and 
having cross pins fitted into snags marked A (Fig. 1) cast on the 
barrel ring. The door is carried by a crane (I, Fig. 1) fixed to the 
side of the shell, stepped into a stene on the ground, and stayed at 
the top te the receiver. The height of door is adjusted by means 
of the screw B (Fig. 2). 
The fittings of the receiver consist of a lever safety valve {C, Fig. 1) 
with a connection for returning any overflow into the tank, a vacuum 
gauge, a pressure gauge, and a draining cock, with a pipe (J, Fig. 2) 
from the bottom of the receiver into the tank. The valve of the 
air exhaust-pipe (D, Fig. 1) is placed on the top of the receiver, and 
the pipe is carried up about 4 feet higher to guard against any 
creosote being drawn into the air-pump. The charging pipe from 
the ferce-pump is connected to the valve E (Figs, 1 and 2) fixed on 
the side of the receiver. 
The air and force pumps and the gearing are driven by a belt and 
pulleys as shown on Figs. 3 and 4. The cast-iron chamber of the 
air-pump # should be 8 inches in diameter and 10 inches of stroke, 
having the bucket fitted with a brass valve and seat. The foot valve 
of air-pump (G) should be of brass, set in a separate casting, so as 
to be easily accessible. The force-pump H should be 24 inches 
diameter and 10 inches of stroke, with a solid cast-iron plunger and 
brass valves. These pumps should be fixed to a pair of cast-iron 
frames, as shown in Figs. 3 and 4, secured to a east-iron sole-plate, 
and they would also carry the guides for the pumps and the plummer 
blocks for the gearing shafts. Both pumps would be driven from 
the main shaft on the top of the frames, which would be driven by 
spur wheels and pinions from the counter shaft carrying the driving 
pulleys, and each pump can be thrown out of gearing as required. 
