II4 VALUATION, DEPRECIATION AND THE RATE-BASE 
TABLE 6. REPLACEMENT REQUIREMENTS 
NUMEROUS ARTICLES. PROBABLE LIFE 20 YEARS 
Each article is replaced as it goes out of use. For an original investment 
of $100 with no betterments or additions. Also for an investment growing 
at the uniform rate of $100 per year. 
(For the special hypothesis as stated in the text.) 
Plant of full growth, . 
erigioal favesiment Growing plant, annual investment $100. 
Replacements per year. Replacements per year.| Begley $100 
$o.25 $ o.25 $0.25 
0.50 0.75 0.38 
0.75 1.50 0.50 
1.01 2.51 0.63 
1.26 3-77 0.76 
1.52 5.20 0.89 
1.79 7.08 1.01 
2.06 9.14 LS 
2.33 11.47 1.28 
10 2.61 14.08 1.41 
IL 2.90 16.98 1.55 
3 3.19 20.17 1.69 
2 3.49 23.66 1.82 
tL 3.80 27.46 1.07 
4.12 31.58 2.17 
TO 4.45 36.03 2.26 
17 4.69 40.72 2.41 
5 5.15 45.87 2.56 
1Yy 5.51 51.38 2.79 
20 5.89 57.27 2.86 
21 5.74 63.01 3.00 
22 5.67 68.68 3-12 
Zi 5.60 74.28 3°23 
: 5.53 79.81 3.33 
3 5.46 85.27 3.41 
2) 5.40 90.17 3.49 
27 5.36 96.03 3.55 
23 5-81 101.34 3.62 
24 5.27 106.61 3.68 
75 5.22 111.83 3-73 
7 4.63 137.28 3-02 
an 4.36 161.04 4.03 
Ca 4.97 185.20 4.12 
5> 5.10 210.54 4.21 
£3 5.07 236.00 4.30 
Go 4.99 261.20 4.36 
65 4.98 286.09 4.40 
70 5.00 311.04 4.45 
Year.