. Report on revaluation of railroads and canals, New Jersey : 1911 . ars and the maximium tenyears, with an average of years. An average life of eightyears has been assumed for the calculations partly for the sakeof using even figures, but mainly to be conservative. With a life of eight years the annual renewals amount to360 ties per mile (assuming 2,880 ties per mile). The followingdiagram therefore illustrates in eight groups, or yearly periods,the various stages in the life of a tie. The vertical lines showthe value of each group in per cent, of the original value foreach of the eight
. Report on revaluation of railroads and canals, New Jersey : 1911 . ars and the maximium tenyears, with an average of years. An average life of eightyears has been assumed for the calculations partly for the sakeof using even figures, but mainly to be conservative. With a life of eight years the annual renewals amount to360 ties per mile (assuming 2,880 ties per mile). The followingdiagram therefore illustrates in eight groups, or yearly periods,the various stages in the life of a tie. The vertical lines showthe value of each group in per cent, of the original value foreach of the eight periods. When the original value is taken immediately after renewalshave been made, or beginning with 100% and terminating , a general value of is found, being abovethe average. Should the initial value be taken immediately before renewalshave been started, the value for the first yearly period will with a final value of zero, giving a general value or below^ the average. 133 lUill^ifl u aJO m DcDC s ([)0 , l- D 1, lU. Dig ^ k /Cook ^^^-^v^^- 134 In the above diagram the renewals have been considered inannual groups of 360 ties and if made at one time the value ofthe ties in one mile of track will be represented by either of thestepped lines, above or below the line A. B., depending uponwhether the initial value at the first period has been assumedafter or before renewals are made, or, in other words, whethertaken at 100% or Consequently where the life of ties is assumed to be eight yearsand the renewals made in annual groups of 360, the value willbe either or , depending upon the time whentaken under consideration. Therefore, if the time be taken immediately after annualrenewals the value will be above the average; if, on theother hand, it is taken before renewals have been made, the valuewill be below the average. The result of observations indicates the first value, or represent more nea
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