Report on the American and Canadian Meat Trade. 347 
which the removahle door is tightly bolted ; a flange of India- 
rubber coming between it and the rim all the way round. This 
door itself also consists of four or five thicknesses of board, 
which are interspaced with air-tight and non-conducting ma- 
terial, similar to the walls of the rooms, and it is firmly fastened 
to the walls. 
Fig. 2. — S. S. 1 Sardinian,' as fitted with Wicke's Patent Refrigerator — 
looking forward. 
At the head of the two rooms running down the sides of 
the ship — the meat-rooms — is a room whose walls are of zinc ; 
this room is filled with blocks of ice. In this room is a 
fan driven by steam, which causes a current of cold, dry air 
to continually circulate through the whole space of the rooms 
which contain the meat. This current of air enters the 
meat-rooms near to the floor of the ice-room, and is with- 
drawn from them by means of a boarded channel which runs 
from the ice-room along the floor of the meat-room to the 
far end, and thence rises to near the ceiling. The withdrawal 
of the air thus occurs at the point farthest away from the 
ice, and near the ceiling, to which the air, whether vitiated 
or not by damp or odour, is compelled to rise. The fan does 
the double, duty of driving the air through the meat-rooms, and 
of bringing it back to the ice-room. Thus the air circulates 
