226 
MINUTES OF PROCEEDINGS OF 
Table IV. 
SHOWING- THE PROPORTION OP RETURNED CARRIAGES, ETC. WHICH ARE PIT POR PURTHEE 
SERVICE, AND OP THOSE WHICH ARE UNSERVICEABLE. 
Length of service. 
No. issued. 
State of carriage. 
Proportion. 
Remarks. 
Service¬ 
able. 
Unservice¬ 
able. 
Service¬ 
able. 
Unservice¬ 
able. 
From 50 to 60 years 
185 
25 
160 
0*135 
0*865 
The mean proportion of 
„ 40 „ 50 „ ... 
24 
5 
19 
0*208 
0*792 
serviceable carriages is 
„ 30 „ 40 „ ... 
1 
1* 
... 
0*491, corresponding to 
„ 20 „ 30 „ ... 
12 
7 
5 
0*583 
0*417 
a duration of 30 years. 
„ 10 „ 20 „ ... 
30 
17 
13 
0*566 
0*434 
hence 0*5 will corre¬ 
,, „ 10 „ ... 
86 
83 
3 
0*965 ' 
0*035 
spond to 29J years. 
* There being only one carriage issued during this period, no comparison can be fairly made. 
Table V. 
SHOWING THE PROBABLE NUMBER OUT OP 1000 CARRIAGES THAT WILL BE POUND 
SERVICEABLE AND UNSERVICEABLE APTER EACH PERIOD OP TEARS. 
No. of 
years. 
Serviceable. 
Unserviceable. 
No. of 
years. 
Serviceable. 
Unserviceable. 
Calcu¬ 
lated. 
Observ¬ 
ed. 
Calcu¬ 
lated. 
Observ¬ 
ed. 
Calcu¬ 
lated. 
Observ¬ 
ed. 
Calcu¬ 
lated. 
Observ¬ 
ed. 
5 
915 
965 
85 
35 
35 
405 
595 
10 
830 
170 
40 
320 
680 
15 
745 
666 
255 
434 
45 
235 
208 
765 
792 
20 
660 
340 
50 
150 
850 
25 
675 
583 
425 
417 
65 
65 
135 
935 
865 
30 
490 
610 
58*8 
0 
1000 
Note.—A similar examination of wheels returned from Corfu, tends to shew that the average 
duration of a wheel composed of—ash felloes, oak spokes, elm nave, is fifteen years; and that out 
of 1000 wheels, the whole may be expected to be unserviceable after thirty years. 
