July 15, 1888. ] 
JOURNAL OF HORTICULTURE AND COTTAGE GARDENER. 
39 
bricks disposed as a semicircle, the ends being also arched to meet 
the quarter circle of the sides. We do not place earth against the 
outer wall of the space, o, but sawdust, to bear the weight of the 
bricks composing the semicircle, the weight of which tends to cause 
the upright 9-inch walls to bulge out. One course below the striking 
of the arches is some strong angle iron, 3 inches on each side of the 
angle, and half an inch thick, one side of the angle to be placed on 
the wall and covered with a row of headers, and the other side close 
on the face of the course of bricks on which it is laid. At every 
bolt being screwed 2 inches, a l|-inch socket pipe is screwed on, and 
its other end let into a stone, v, that must be on hard ground, which 
if not naturally so must be rammed until it is like iron. These pro¬ 
visions must be made on both sides, and at both ends, so far as door¬ 
ways will admit. To keep the internal arch firm we place every 
alternate brick in the course of the outer arch wall on which the 
angle iron is placed through far enough to reach the bricks of the 
other arch. (The outside of the last arch, or that face next the sawdust 
should be plastered with cement, and the internal one also, but inside 
Fig. G.—Scale 8 feet to 1 inch. 
Fig. 7. 
3 feet along the angle iron, and on its exposed face, should be made 
a hole for an inch bolt, whose outer end must have a 2-inch solid 
socket, for which a 1^-inch wrought pipe is prepared to screw on 
2 inches. We have in building to put in clamps or straps of 3 inches 
by half an inch bar iron, with an inch hole 3 inches from the upper 
end, and the lower to pass through the wall at a foot above the 
foundation, and to turn up 3 inches in the space o. We put straps 
in, of course, as the wall is built, and when the angle iron is put on 
we introduce the bolts through the holes in the straps and also 
through the angle iron, securing them with nu's. The head of the 
The house as described will hold 172 cubie yards of ice when 
thoroughly filled, and will preserve it for a long time, though in order 
to effect this the doors must be closed, and the spaces between each 
stopped tightly up with dry straw or straw shutters, placing one 
against the other, when it is as safe for keeping as if it were 
hermetically sealed. It is surrounded with air at a temperature as 
low as that of the ice, and can derive no heat except through the 
2 feet thickness of sawdust. The valves are to remain closed, for it 
is necessary that the air in o be kept still, and to open them would 
only admit air of a higher temperature. If, hjwever, after filling the 
