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<br />~ <br />c.. <br />C"': <br />C\l <br /> <br />c <br /> <br />of the project, classified generally under the F. P. C. system <br /> <br />of accounts and grouped under the principal units of operation. <br /> <br />In considering these annuities, physical wear and tear only <br /> <br />was taken into account. <br /> <br />In selecting the annuity appropriate to a single item of <br /> <br />equipment, such for example as a main generator, the following <br /> <br />features were passed in review: <br /> <br />(1) The character of the structure and its sub- <br /> <br />divisions under such items as castings, forgings, <br /> <br />stampings, windings, etc. <br /> <br />(2) Stationary and moving parts, end the character <br /> <br />and extent of probable physical wear and tear. <br /> <br />(3) The first cost of the item. <br /> <br /> <br />(4) The estimated mean weighted life. <br /> <br /> <br />(5) The probable cost of replacement in relation <br /> <br />to original cost. <br /> <br />(6) The annuity required to produce the replacement <br /> <br />sums required, accumulated OVGr the period of <br /> <br />amortization, but anticipClting partial withdrawals <br /> <br />at distributed intervals throughout this ueriod. <br /> <br />( Se e no te appended ('In page 22.) <br /> <br />The group of operative lll1its Nl-N4 was then considered carefully <br /> <br />under this schedule of factors, and estimates made of the annuities <br /> <br />appropriate to the several items as listed in exhibit 63. <br /> <br />,,, <br />