The earnings per train-mile vary greatly; but for all the lines the average is 7s.
So far as their earnings do not exceed 150 perannum, thefollowin~ classes are under the legal obligation to insure: laborers in mines quarries,dockyards,wharves, manufactories and breweries; bricklayers and navvies; post-office, railway, and naval and military servants and officials; carters, raftsmen and canal hands; cellarmen, warehousemen; stevedores; and agricultural laborers.
Such crude attempts as were made to prevent rates from being excessive concerned themselves with profits, and were designed to confiscate for the state treasury any earnings beyond a certain prescribed dividend.
It made provision for publicity of rates and for due notice of any change in rates; it forbade pooling of freight or earnings, and required annual reports from the carriers.
To provide for the repayment from earnings of the capital invested in a mining property and expended in development, and to provide for the depreciation in value of the plant and equipment, an amortization fund must be accumulated during the life of the mine; or, if it be desired to continue the business of mining elsewhere, a similar fund must be created for the purchase, development and equipment of a new property to take the place of the original deposit when that shall be exhausted.