﻿REFRIGERATION OF DRESSED POULTRY IN TRANSIT. 



21 



presents a general openness. Type B, with the same thickness of 

 insulation, is more compact, but does not have the upturned edges 

 to protect the corners (fig. 6, b). Type C is characterized by a heavy 

 layer of hair felt, 1-J inches thick, packed closely between the ceiling 

 and subceiling with no intervening air space (fig. 6, c). In figure 

 6, d, is shown a roof with insulation of the same thickness as the 

 preceding one, but separated into three layers with intervening air 

 spaces. Figure 6, e, represents a roof with 2 inches of hair felt insula- 

 tion, each of the two layers being protected on both sides with 



■Pt/PUA/E 



SL/B-PUPL/A/E 

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 SOB-POOP 

 £ "L/A/OPELT 

 /A/SOLAT/OA/ 

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-/POOF 

 SC/B-POOP 

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 /A/SULAT/OA/ 



MAT/? 

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POOP 

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/ "A/A/P PELT 

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 CE/L/A/G 

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POOP 

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'PAPEP 



■£ "HA/P PELT 



CE/L/A/G 



OUTS/OE POOP 

 SHEATH/A/G 



L " ha/ p pelt 



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'OOP 

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W&SMs- HA/P PELT 



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Fig. 6.— Cross sections showing roof insulation of different types of refrigerator cars: a, Type A; 6, type B; 

 c, type C; d, roof insulation separated into three layers; e, roof insulation with 2 inches of hair felt; 

 /, type D. 



insulation paper. Type D (fig. 6, /) also has two thicknesses of 

 1-inch hair felt, with the additional precaution of upturned edges. 



Floor. — The floors of types A and B (fig. 7, a, b) are equipped with 

 two thicknesses of half -inch insulation separated by air spaces. 

 Types C, D, and F (fig. 7, c, d,f) have one layer 1 inch thick, and type 

 E (fig. 7, e) has three layers one-half inch thick, with weD-protected 

 joints. 



Comparison. — There is but very little difference in the side-wall 

 insulation of the four types of cars whose efficiency indices are 

 given in Table 5. Each type is provided with 1 inch of the non- 

 conducting material. Although the insulation of A and B is 

 divided into two half -inch layers in contrast to the single 1-inch 



