324 VALUATION, DEPRECIATION AND THE RATE-BASE 
29. ANNurrYy WHICH ONE DOLLAR WILL PURCHASE ................. 463 
These annuities are given for periods of years up to 100 years. 
Interest rates 1 to 10 per cent per annum. Carried out to 8 
decimal places. 
30. THE PrOBABLE USEFUL LIFE OF MACHINERY STRUCTURES AND 
ABP EAN CE rato e ee er To ee La te lr le Tok reife ala Uo AL 5 
The probable useful life is noted in this table for a large variety of 
items, together with authority for same. 
31. EXPECTANCY AND REMAINING VALUE ON THE ASSUMPTION THAT 
No ArticLE WILL SURVIVE TWICE ITs ORIGINAL EXPECTANCY. 432 
A discussion of the method of estimating the expectancy or re- 
maining life and the remaining value of an article which is no 
longer new, precedes the table. 
32. Expectancy oF Human Lape. ........000 00000 0 lL LLL 446 
This table is based on the experience of life insurance companies. 
33. AMORTIZATION AND DEPRECIATION.................coooveniennn.. 452 
The usual information covering interest rates from 4 to 7 per cent 
per annum and useful life terms of 2 to 75 years is given in these 
tables. In addition by use of sub-headings the table also gives 
the present value of articles whose remaining useful life is known. 
The table is preceded by an explanatory statement. 
,