The Canadian Horticulturist. 



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Fiu. 4S7 — Sf.ction 

 of Wall. 



usually galvanized iron, which forms a large pan or vessel 

 in which all meltage water is collected. Water is very destruc- 

 tive to the ice, and the warm air is kept away from the top of 

 the ice to prevent the moisture from being condensed there and 

 settling into the ice. When the ice is low in the ice chamber, 

 vapor may accumulate in the space above the ice. A ventilator 

 in the top of the room is of service in conducting this away from 

 the ice and keeping it dry. As the water from the melted ice 

 will absorb air and gases, it is spread out over as large a surface 

 as practicable, and the air is conducted over it to be purified. 

 There are several plans by which these general features are 

 accomplished in the construction of cold storage houses, some 

 of which have been patented. The plans shown in the illustrations 

 embrace the essential features of good cold storage construction. 

 The general arrangement of cold storage houses for any size is 

 as shown in Figs. 485-488. Large houses require a girder 

 and posts under the centre of the ice floor, and the air flues are 

 best made double, with one set at each side of the girder along 

 the centre of the room. The construction of the walls varies. 

 Walls filled with sawdust, charcoal, tan bark, or other non- con- 

 ducting materials, have been in use for many years. Carefully 

 conducted tests, however, have proved conclusively that a wall 

 of this description is inferior to a wall which contains dead air spaces, felt or 

 paper linings, a section packed with mineral wool, and an outer circulating 

 spaces a which are open to the outer air at the sill, and at the top open into 

 air space. The wall shown in Fig. 487 gives good satisfaction. It comprises air 

 the loft under the roof. Dampers (d Fig. 486) are placed at the bottom so they 

 can be closed when desired. The next section of wall b (Fig. 487) is of dry saw- 

 dust, packed in place between walls of matched boards ; the outer surfaces of 

 these walls are lined with prepared waterproof paper. The inner section e 

 contains dead air spaces which are about twelve inches square. The inner 

 wall is of matched lumber, and the outer one is of weather boards. This con- 

 struction keeps the sawdust dry and the walls free from dampness. There 

 should be large flues/ (Fig. 486) through which the air circulates. The drainage 

 and meltage water is carried off by a trapped drain e. The galvanized iron floor 

 can be flushed through openings s made for the purpose. A wooden backing g 

 is placed below the iron floor. Wooden slats h hold the ice above the meltage 

 water, and the outer air spaces carry off the heat imparted to the weather 

 boards by the direct rays of the sun. When the air is humid or charged 

 with moisture these air channels are tightly closed. The thickness of the 

 walls may be varied with the capacity of the building. Additional sections 

 of filling and dead air are required for larger houses where great quantities o 

 goods are refrigerated. The cold storage house shown in Figs. 486 and 488 



