Accounting theory and practice, Volume 2 (of 3) : a textbook for colleges and…

7. Probable change in the requirements of the market,

necessitating an adaptation of the equipment to uses for which it was not originally intended. At the time of installation the rate of depreciation must be based only on the normal factors—things which can with reasonable certainty be counted on. At intermediate periods in the life of the asset, a physical inspection should be made to compare the actual depreciation of the property with the estimated. If, then, it is found that any contingent factors have become real or reached the point of reasonable expectancy, these provide the basis for an adjustment of the rate for the remaining life-term of the asset. Basis of Normal Rate With regard to the normal rate, the following items demand first consideration: “1. Exterior or movable apparatus (a) Abuse (b) Neglect (c) Temperatures (d) Oxidation (e) Irregular shocks in use, such as starting or braking, also road or rail defects