124 



JOURNAL OP HORTICULTURE AND COTTAGE GARDENER. 



[ Febraary 8, 1872. 



in the space o. We jjut strajis iu, of course, as the 'wall is 

 ■buUt, and wheu the angle iron is jjut on we introduce the bolts 

 through the holes in the straps, .ind also through the angle 

 ii-on, securing them with nuts. The head of the bolt being 

 screwed 2 inches, a IJ-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 bo rammed until it is like 

 iron. These provisions must be made on both sides, and 

 at both ends, so far as doorways wUl admit. To keep the in- 

 ternal arch firm we place every alternate brick in the course of 

 the outer arch wall on which the angle u-on is placed, 

 through far enough to reach the bricks of the other arch. The 



Fig. 1.— SctL'e E feet to 1 inch. 



outside of the last arch, or that face next the sawdust, fhould | thoroughly filled, and wUl preserve it for a long time, fhougb 



be plastered with cement, and the internal one also, but insiile. in order to effect this the doors must be closed, and the spaces 



The house as described will hold 17'2 cubic yards of ice when | between each stopped tightly up with dry straw or straur 



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 be kept still, and to open them would only admit air of 



a higher temptrature. If, however, after filling the house 

 with ice, the weather should be mild for a time, and then be 

 followed by a severe time of frost, it will be judicious to open 

 the valves, and, displacing the air in o, replace it with that at a 

 lower temperature. The valves should be closed when a mini- 

 mum has been secured, and should not be opened again until 



