AN IT-TO-DATK (iAMK-LARDKR. 



99 



the walls, but good insulation will stop the heat passing through ami so make less work for the machine. 

 For this reason it is always worth while to spend a little extra on thoroughly good insulation, and so save 

 not only on the first cost of the machinery, but also on the running expenses during the whole period of 

 the existence of the plant. The insulating material should be from six to eight inches in thickness, varying 

 according to its insulating value and the temperature at which the store is to be kept. The beM and 

 most efficient method of insulating a cold store is by means of cork, supplied in slabs formed of small 

 pieces compressed into one piece. F.ach slab is two inches in thickness, and three layers of this should 

 cover the walls, floor and ceiling of the store. The slabs are laid so as to break joint, and are held in place 

 by means of odourless pitch. The whole surface is then covered with a thin layer of white cement, which 

 gives a very nice finish and enables the chamber to be washed out when desired. A somewhat cheaper 

 method of insulation is to place battens six to eight inches in length against walls, floor and ceiling, and to 

 nail match-boarding to these, the space of six or eight inches thus formed between the boarding and the 

 brickwork being tilled with a material known as slag wool or silicate cotton. When this is done it i-, often 

 well to have a layer of waterproof paper on each side of the slag wool, as it readily absorbs moisture, 

 and when this occurs it loses its value as an insulator. Other materials are sometimes used when 

 insulating with this method, the commonest kind being granulated cork, flake charcoal, sawdust and 

 cowhair. 



It will be noticed that the plan shows a lobby or air-lock, out of which the cold chambers open. 

 The object of this is to prevent an inrush of warm air when the cold room is entered. Before opening 

 the larder door the lobby door should be closed, and similarly the larder door should be closed belore 

 opening the door of the frozen storage-room. The doors are spe&amp;lt; ially made with a taper, so as to lit tight 

 when they are closed, and are insulated with the same thickness as the walls. The approximate cost of 

 the plant described is three hundred pounds. 



Illustrated in Fig. i2iS.\ is a very convenient apparatus for hanging the birds in the cold store. This 

 provides lor a large number of birds in a small space without their being too tightly packed together. 

 The upper rows hang clear of the lower ones, so that there is no fear of blood dripping on to them ; the 

 whole apparatus revolves, which facilitates handling. Without an apparatus of this sort it is difficult 

 to make use of the space in the centre ol the store, as birds can onlv be hung on rails attached to the walls 

 and ceiling. Drni.i-Y (i. (i(&amp;gt;Ki&amp;gt;t&amp;gt;.\. 



FIG. 12 8. \ 



