18 BULLETIN 17, U. S. DEPARTMENT OE AGEICULTUEE. 
Table 5.— Prevailing temperatures and icing records during efficiency tests. 
ft 
Temperature of at- 
•S p 
p-m 
Temperature of 
o 
mosphere. 
03 g 
^S 
car. 
p 
s% 
a>,Q 
Experiment 
Xo. 
Dale of 
loading. 
o . 
03 
>._o 
C3 
bib 
"d 
03 
_o 
o 
t>> 
03 
■s 
>> 
C3 
>> 
03 bib 
o n 
o <o 
® S'fi 
*" d 
^TJ 03 
£ 8.2 
®'P «H 
S— ® 
O 03^ 
pd 
CD 03 
oo 
II 
bi 
p 
! 
o 
« 
.5 
03 
O 
9 
-d 
CD 
■d 
1 
CD 
T3 
-d 
-d 
03 
Q || 
o W 
tt^ — ' 
<D 
-d 
P 
ft 
tt 
w ^ 
Eh 
P 
< 
PC 
< 
Type A: 
1910. 
°F. 
°F. 
°F. 
°F. 
His. 
°^. 
°F. 
°F. 
°F. 
Pounds. 
Per cevt. 
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 
55 
57 
57 
57 
15 
15 
33 
35 
50 
11,900 
10 
.71 
Aver . 
.71 
Type B: 
1911. 

===== 
=== 
===== 
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. 
= 
= 
TypeD: 
2059 
July 7 
81 
80 
84 
80 
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 
2080.... 
Apr. 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 wijl 
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 
