William R. Day,
Von Baumbach v. Sargent Land Company…
“ It is common knowledge that business concerns usually keep a depreciation account, in which is charged off the annual losses for wear and tear, and obsolescence of structures, machinery, and personalty in use in the business. We do not think Congress intended to cover the necessary depreciation of a mine by exhaustion of the ores in determining the income to be assessed under the statute by including such exhaustion within the allowance made for depreciation. ”
