ILLINOIS STATE DAIRYMEN'S ASSOCIATION. 181 



cool tlie brine to the desired temperature, which will hold 

 the temperature of the room from the time the compressor is 

 stopped until the next day, temperature of room not raising 

 over seven degrees. 



The insulation of the box or room to be cooled is of the 

 greatest importance. It can not be too perfectly constructed. 

 It is cheaper to put a little additional money in the construc- 

 tion of the box or room at the start than it is to daily lose 

 the cold through badly constructed or half insulated walls and 

 a loosely shutting door. A description of one of our cold 

 rooms might be of help to any one who contemplates building 

 a box or room of this kind. 



First we put up 2x4; these were covered on both sides 

 with paper, then with matched flooring; then on the inside 

 we covered the flooring with paper, then put on a two-inch 

 strip, covered this with paper, between these two papers we 

 put in a thickness of two inches of mineral wool paper, we 

 we covered with flooring, then a thickness of paper, then put 

 on one-inch strips, covered these with paper, and it with 

 flooring, making four thicknesses of flooring, six of paper, one 

 of mineral wool, making three air spaces. 



But running our compressor four to five hours daily we 

 can keep our room, which is eight feet wide, fifteen feet long 

 and eight and one-half feet high, at between 33 and 40 degrees 

 night and day. 



The temperature at time of shutting down is 33 degrees 

 during the night. The temperature will not raise over seven 

 degrees. We have one room that is not as well insulated 

 that we do not try to keep as cold as the one at our Hinckley 

 factory. This room has only one-four inch air space or thick- 

 ness of mineral wool. A record we kept of the ice machine 

 shows that for seven days, beginning June 14th and ending 

 June 20, 1895, the average temperature of the room at time 

 compressor was stopped was 44 degrees. The temperature of 

 brine in tank was 26 degrees ; that the temperature of the room 

 the next morning for four days was 50 degrees and three days 

 the room was 52 degrees ; that the brine for five days or nights 

 warmed up to 38 degrees and two days warmed up to 40 de- 

 grees; the compressor was run three hours per day for two 

 days, three and one-half hours one day and four hours four 



