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BULLETIN 17, U. S. DEPARTMENT OF AGRICULTURE. 



of economy. Will the saving in ice, resulting from extra insulation, 

 be sufficient to pay for the additional insulation ? 



Walls. — Figure 5, a, h, 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 sublining in this wall. Type B is insulated 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 



SIDING 

 FIBER PAPER 

 AIR SPACE' 

 ■L" LINOFELT 

 AIR SPACE 

 UB- LINING 

 " UNO FELT 

 AIR SPACE 

 FIBER LINING 

 INSIDE LINING 



LINING 

 'AIR SP4CE 

 RARER 

 WOOL FELT 

 SUB-LIN/NG 

 AIR SPACE 

 SUB-LIAIING 

 (TWO THICKNESSES 

 y" WOOL FELT 

 ■PAPER 

 ■A/R SPACE 

 SIDING 



LINING 



PAPER 



■I" HAIR FELT 



PAPER 

 SOB-LINING 

 AIR SPACE 



TAPER 

 SIO/NG 



SIDING 

 -PAPER 



§"SUB-LIAIING 

 AIR SPACE 

 — PAPER 



I "HAIR FBLT 

 PAPER 

 -AIR SPACE 

 PAPER 

 #- " /A/SIDE LINING 



d 



LINING 

 A/R SPACE 

 /" HAIR FELT 

 SUB-LINING 

 A/R SPACE 

 SUB-SIDING 

 SIDING 

 PAPER 



LINING 

 PAPER 

 IIP SPACE 

 HAIR FELT 

 HAIR FELT 

 PAPER 

 SUB-LINING 

 AIR SPACE 

 -t" HAIR FELT 

 PAPER 

 •ID/A/G 



f 



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 l-inch layer of hair felt;/, wall having three half-inch 

 layers 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,f, 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 cars. 

 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 



