38 



KGGS IN COLD STORAGE. 



Gay's system 

 of box coils. 



center of the room. This obliges the circulation to 

 spread so as to cover a large portion of the cross-sec- 

 tion area of the room, as indicated by the arrows, but 

 has the effect of reducing its volume to some extent. 

 This ceiling apron should have a slant of not less than 

 one foot in ten. It occupies some considerable space, 

 but is richly worth it. The opening into outer edge 

 of apron in center of room need not exceed three 

 inches in depth in most cases, and, as some space 

 must be left at the top of room for air circulation 



with the wall coils, without ceiling apron, not much 

 space is wasted by its addition. 



Fig. 5 gives us an entirely different arrangement 

 of piping, but with essentially the arrangement of 

 aprons shown in Fig. 4. This is the system advo- 

 cated by Mr. C. M. Gay on page 106 of the August, 

 1897, number of Ice and Refrigeration, and the 

 writer believes it to be the best idea for air circula- 

 tion of any having pipes directly in the room. The 

 following is quoted from Mr. Gay's description: 

 " Upper pipes of box coils should be about ten inches 

 below the ceiling of the room, to prevent sweating. 

 When brine or ammonia is turned into these pipes 

 (as shown in Fig. 5), the cold air around the pipes 

 seeks an outlet downward and passes between the 



