20 
BULLETIN 17, U. 
DEPAEIMEXT OF AGBICULTUBE. 
of economy. Will the saving in ice, resulting from extra insulation, 
be sufficient to pay for the additional insulation I 
Walls. — Figure 5. a. b. c } and d. illustrates cross sections through 
the side walls of the cars of types A, B. C. and D, respectively. 
Type A is insulated with two thicknesses of half -inch linofelt. one 
layer on each side of the main frame. There is but one thickness of 
paper and one sublhiing in this wall. Type B is insidated in nearly 
the same manner, except that wool felt is used instead of linofelt. 
Type C uses one thickness of 1-inch hair felt, compactly arranged 
between the lining and sublining. There is no attempt in this type 
to maintain a dead-air space. Type D likewise has a 1-inch layer 
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Fig. 5. — Cross sections showing wall construction of different types of refrigerator cars, a, Type A: 
b, type B; c, type C: d, type D: e, wall having a 1-inch layer of hair felt:/, wall having three half-inch 
lavers of hair felt. 
of hair felt, but has not the same solidity: there is an air space on 
each side of the insulation. Figure 5. e, illustrates a side wall with a 
1-inch layer of hair felt, supported on one side by a sublining. In 
this wall there is an additional sublining next to the siding. Figure 
5,/, shows three half-inch thicknesses of hair felt, two of which are 
together on the inside of the frame, the other being on the outside 
of the frame. 
Roof. — Figure 6. a. illustrates the roof insulation of type A ears. 
Two thicknesses of one-half inch linofelt are separated by a wide 
air space. The edges of the insulation are turned up along the sides 
of the car to give a more compact joint. In appearance this roof 
