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only on the basis of these assumptions that we can truly assure that the force necessary to turn our industrial wheels will be available when we need it, and in the quantities we require.

In conclusion, I want to say that I endorse Senator O'Mahoney's proposal. I should like to see it broadened, of course, to include the scope of the inquiry proposed by Senator Myers. It would be most desirable for this inquiry to be carried out by a Commission in which both the Congress and the Executive would be represented. I think that for a fact-finding job which could well provide the foundation for expression of future policy, this approach has much to commend it. It is, of course, up to the Congress to determine the vehicle through which this investigation should be carried out. I am merely suggesting the approach which to me seems most desirable.

So that the committee may have available for consideration, I am submitting here a set of charts which contain data showing significant trends in production consumption of energy sources.

I submit the charts.

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FIGURE 1.-Annual supply of energy from mineral fuels and water power in the United

States, 1899-1949.

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FIGURE 2.-Percentage of total British thermal units equivalent contributed by the several mineral fuels and water power in the United States, 1899-1949.

TABLE 1.-Annual supply of energy from mineral fuels and water power in the United States, 1889 and 1899–1949, in trillions of British thermal units1

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1 The unit heat values employed are: Anthracite, 12,700 B. t. u. per pound; bituminous coal and lignite, 13,100 B. t. u. per pound; petroleum 5,800,000 B. t. u. per barrel; natural gas, 1,075 B. t. u. per cubic foot. Water power includes installations owned by manufacturing plants and mines, as well as Government and privately owned public utilities. The fuel equivalent of water power is calculated from the kilowatt-hours of power produced wherever available, as it is true of all public-utility pants since 1919. Otherwise, the fuel equivalent is calculated from the reported horsepower of installed water wheels, assuming a capcity factor of 20 percent for manufactures and mines and of 40 percent for public utilities.

2 Fuel equivalent calculated by assuming the average central-station practice for each of the years for which data are available.

3 Data not available.

4 Subject to revision.

TABLE 2.—Percentage of total British thermal unit equivalent contributed by the several mineral fuels and water power in the United States, 1899–1949 1

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