ON HAIL-ROADS.
185
EXPERIMENT II.
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DESCRIPTION OF CARRIAGES.
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1
Loaded carriage, weighing 231 cwt., and con-
lb.
lb.
lb.
(aining 53cwt. of Coals, Total weight 7GJ cwt.Wheels cast-iron, case-hardened, and had been inuse six mouths. The bearings upon the axlesof cast-iron, four inches broad -
56
22
39
2
Loaded carriage, same weight as the preced-ing, wheels cast-iron, but not ease-hardened, andwere worn considerably. Chairs or bearingsbrass, 1J inches broad -
78
48
63
3
Four empty carriages, each weighing 231 cwt.Three with case-hardened wheels, and one with"'heels not case-hardened, same kind of bearingsas No. 1.
74
32
53
4
Four empty carriages, same weight as the pre-ceding, three with common, and one with case-hardened wheels, bearings brass, similar to
No. 2. - - - -
91
49
70
5
Four empty carriages, same weight as No. 3.,all with old wheels, not case-hardened, much
worn or indented on the rim, wrought-iron bear-ings, 11 inches broad - -
112
70
91
6
The preceding twelve empty carriages toge-ther - - - -
After the above experiments were performed,there appeared such a variation in the resultbetween the carriages, having different kinds ofwheels and bearings, the following were madeto ascertain how r much the resistance "'as affect-ed by each. -
Four empty carriages, and weighing 231 cwt..
277
149
213
7
all with case-hardened wheels, and cast-ironbearings, similar to No. 1. -
72
29
50
8
Four empty carriages, same weight, with case-hardened wheels and brass hearings, same as
\o. 2. - - -
75
33
54
S
Four empty carriages, same weight, wheelsnot ease-hardened, half wore, bearings similar to
No. 7.
90
48
69
10
Four cmply carriages, same weight, wheels
same as preceding, or No. 9, brass bearings,similar to No. 8. -
96
54
75
11
Four empty carriages, same weight, casc-hard-rned wheels, wrought-iron bearings, 8anre a>