﻿18 BULLETIN 17, U. S. DEPARTMENT OF AGRICULTURE. 



Table 5. — Prevailing temperatures and icing records during efficiency tests. 







Temperature of at- 



be 4) 



S-i O) 



Temperature of 







o 









mosphere. 





03 g 



*S 





car. 









a 

















Qj £i 













— . 





















Experiment 



Date or 



o 



bo 



.3 



03 



03 60 



ng» 



S^ be 



<u 03 



bb 



bb 



.9 







£Hm 



Xo. 



loading. 



•™ bo 



03 



>.o 



C3"" 1 



■a 



03 



_o 



<3 

 >> 



03 



u • 



0* bC 



>, 



03 



73 .3 



CO 

 O n 



o ° a 



w c — 



o"5"3 



bo<~ 



r-i 03 . 



o 3 a 



T3 

 03 



■a 



O 



03 



03 



T3 



■d 



03 



T3 







A 



R 



W 



w * 



Eh . 



A 



< 



pa 



5j 





K3 





Type A: 



1910. 



°F. 



°F. 



"F. 



"F. 



Hrs. 



°F. 



D JT. 



°F. 



°F. 



Pounds. 



Per cent. 





1017 



Mar. 15 



43 



44 



56 



56 



20 



22 



33 



28 



39 



8,400 



8 



0.72 



1021 



Apr. 6 



45 



53 



56 



56 



13 



14 



34 



28 



50 



7,200 



10 



.72 



1025 



Apr. 21 



58 



69 



57 



35 



14 



17 



40 



32 



54 



9,600 



10 



.72 



1027 



May 4 



49 



52 



52 



52 



14 



14 



34 



31 



47 



9,600 



10 



.70 



1029 



May 13 



00 



57 



57 



57 



15 



15 



33 



35 



50 



11,900 



10 



.71 



























.71 





1911. 



























Type B: 



























2056 



June 16 



76 



81 



81 



72 



10 



25 



35 



37 



52 



16, 000 



15 



.60 



2060 



July 14 



80 



80 



81 



75 



32 



36 



39 



37 



52 



10, 000 



10 



.60 



2062 



Sept. 1 



74 



73 



78 



75 



22 



35 



39 



34 



42 



12, 000 



15 



.58 



2064 



Sept. 15 



81 



84 



76 



72 



12 



34 



38 



41 



54 



10, 000 



10 



.65 



2081 



Apr. 30 



64 



53 



66 



69 



20 



35 



41 



36 



48 



6,000 



10 



.63 



2083 



May 4 



72 



72 



75 



67 



8 



27 



36 



36 



46 



10, 000 



10 



.64 



2084 



May 14 



57 



56 



59 



55 



9 



21 



35 



30 



44 



8,000 



10 



.65 



























.62 





1912. 



























Type C: 



























2085---. 



May 25 



79 



76 



67 



70 



13 



24 



37 



38 



50 



9,000 



10 



1.01 



2092 



Aug. 24 



77 



77 



79 



80 



18 



24 



40 



38 



68 



10, 000 



10 



1.04 



2093 



Aug. 29 



82 



81 



84 



84 



13 



24 



37 



36 



46 



10, 000 



10 



1.04 



2094 



Sept. 20 



63 



67 



70 



63 



15 



19 



38 



33 



48 



8, 000 



10 



1.04 



2096 



Sept. 27 



60 



61 



60 



54 



18 



20 



38 



31 



47 



7,000 



10 



1.05 



2099 



Oct. 18 



63 



66 



57 



55 



14 



22 



36 



31 



48 



7,000 



10 



1.02 



























1.03 





1911. 



























TvpeD: 





























July 7 



81 



80 



84 



SO 



27 



27 



41 



43 



50 



10, 000 



10 



1.19 



2063 



Sept. 8 

 1912. 



78 



80 



77 



77 



43 



37 



39 



42 



47 



6,000 



10 



1.17 



2077 



Apr. 13 



68 



69 



71 



73 



16 



28 



34 



41 



52 



5, 800 



10 



1.22 



2078 



Apr. 17 



63 



61 



42 



46 



18 



25 



34 



34 



48 



5,000 



10 



1.23 



20S0 



Anr. 16 



64 



66 



64 



55 



16 



27 



36 



36 



48 



5,000 



10 



1.17 



2082 



May 1 



53 



64 



73 



71 



27 



34 



40 



31 



40 



5,000 



10 



1.17 



2089 



July 11 



76 



76 



82 



82 



10 



26 



33 



35 



50 



7,000 



10 



1.25 



2090 



July 26 



84 



77 



74 



76 



18 



29 



40 



40 



60 



7,000 



10 



1.17 



2091 .... 



Aug. 2 



73 



78 



65 



62 



40 



28 



38 



40 



58 



11,000 



10 



1.12 



Aver . 



























1.19 































COMPARISON OF CAR CONSTRUCTION. 



With a measure of the gross efficiency of the different types of cars 

 as a working basis, an analysis of the construction of these types will 

 reveal certain features which appear indispensable in effective 

 refrigerator cars. 



INSULATION. 



There are many kinds of insulating material now in common use, 

 cork, hair felt, wool felt, mineral wool, and various vegetable fibrous 

 materials. The old-time idea of a dead-air space in refrigerator cars 

 is no longer plausible. The car builder has been unable to con- 

 struct a car with a dead-air space which will remain air and moisture 



