ACTUAL AND PROBABLE LIFE ; 
TABLE 7. THE REPLACEMENT REQUIREMENT IN THE CASE 
OF NUMEROUS ARTICLES AND A COMPARISON OF 
METHODS OF PROCEDURE 
PROBABLE LIFE 10 YEARS 
With due regard to expectancy at various ages. Numerous articles. 
All installed at same time. No additions to plant. Articles replaced as 
worn out. Original investment $100. Interest 6 per cent. Net earnings 
6 per cent. 
‘(Based on the hypothesis of failures as explained in the text.) 
pry, Straisht Line Method. + Equal Aunual Payment - ypmited Life Method. 
able ~~ ‘ - : = = 
“aT repl't 'Amorti-| peqrd Amorti-! Req'd Rem'g | Repl't | Requ'd 
+  Rem'g zation q Rem’g zation a sem gr so equ 
requ't. - - t- , allow- - 
wale, allow | SR (value! allow! | fam ive. allow. Cearn 
$1.00/8100 $10 $16 .00/$100 87-59 [$13. 50! $100 $1.00] $7.00 
2.01] Ox | 10 15.46] 093 8.0or 13.59 100 2.01] 8.o1 
3.04] 83 10 14.98 87 18.37 13.59 100 3.04 9.04 
4.10, 76 10 14.56] 81 18.73 13.59 100 4.10] 10.10 
5.200 "70 Io 14.20 76 19.03 13.59] 100 5.20 11.20 
' 6.36] 65 Io 13.90 7I 19.33 13.59 I0O A 12.36 
. y 1.57] 62 10 13.72) 68 | 9.51 13.59, 100 ¢ 7.57] 13.57 
8.87] 39 10 13.54| 66 19.63 13.59 100 8.87: 14.87 
10.25] 58 10 13.48) 64 9.75 13.590 100 10.25 16.25 
12 11.73] 58 10 13.48| 64 9.75 13.59 1I00 II.73} 17.73 
ll 11.331 6o 10 13.60 65 9.69 13.59 100 11.33] 17.33 
2 11.03 61 15 - 13.66) 66 | 9.63 13.59 100 11.03 17.03 
10.79] 62 10> 13.721 67 9.57 13.59) 100 10.79 16.79 
10.60, ¢ is 13.78) 68 |, 9.51 13.59 100 10.60 16.60 
- 10.46, 6: 1 13.84) 69 | 9.45 13.59 100 ' 10.46 16.46 
ty 10.28] 6 > 13.84) .... | .... 13.59 100 10.28 16.28 
1’ 10.091 10 3.0 c+eo | +... 13.59] I00 10.09 16.09 
, 9.85 10 13.90] .... | .... 13.59 100 9.85 15.83 
1) 9.53] 3 13.90] .... 4 «a 13.59 TOO 9.53 15.53 
«> 9.10 22 13.84 69 | 9.45 13.59 100 9.10 I5.IO 
‘I 9.53 ie 13.78] Lo bu. 13.59 100 9.53 15.53 
or 9.84 3 13.78 .... | .... 13.59 100 9.84 15.84 
: 10.05] b- 13.78" .... | .... 13.59 100 10.05 16.05 
2. 10.17 br 13.78 .... | .... 13.59] 100 710.17] 16.17 
% 10.22 1 13.78 68 | 9.51 13.59 100 10.22] 16.22 
2 10.22! | 15 13.78] .... | .... 13.59] 100 | 10.22] 16.22 
Zz: I0.17/ 000% fod 13 cove | +... 13.59 100 | 10.17 16.17 
2 10.11 €; 8) 13.781 .... ; ...." 13.50] 700 }'10.11 16 XX 
29 10.03 64 Io 13.84 ...., JS. 13.50, 100 10.03 16.03 
30, 9.97 64 TORE IS. B41 +» al vee 13.50] 100 | 9.97] 15.97 
Departure of Actual Failures from Assumed Laws. — While it 
may be granted that in the long run the failures of individual 
articles in any class will follow some definite law (perhaps a law 
IIc 
v.