Increased use of power
3. Machinery is applicable in very different degrees to the different processes and industries. Machinery can save much labor in some directions, little or none in others. It is especially adapted to the application of power. In the United States, in 1870, in manufactures alone, two and one third million horse-power were used; in 1900, eleven and one third million, the increase being five-fold. It is said that in the world, in 1870, three and one half million horse-power was furnished by stationary engines, ten millions by locomotives. Probably to-day the total is four-fold as great.
Machines can best be used in manufactures
Machinery is applicable with especial advantage to industries that change the form of materials easily transported and widely used. There must be a large output to justify the use of machinery. In 1840 a man's work in spinning cotton was three hundred and twenty times as effective as in 1769, in 1855 it was seven hundred times; and though the rate of improvement is diminishing, to-day the productivity of such labor is still greater. Similar examples are found in the manufacture of shoes, and in all varieties of wood- and iron-work. Machinery is most applicable where there is a compact plant; not so easily where the power has to be distributed over a wide area, unless a special track can be provided.
Not to so great an extent in agriculture
Machinery, therefore, has affected manufactures much more immediately and greatly than it has agriculture. It has not as yet, for example, been found practicable to apply steam to ploughing to any great extent. As the profitable use of most farm machinery requires a level surface and a large area given to a single crop, it cannot be used as well east of the Alleghany Mountains as in the Mississippi Valley, and it is still uneconomical in large portions of the civilized world. Despite this difficulty the methods of the farmer of to-day contrast strongly with those of one hundred or fifty years ago. Planters and seeders, reapers, harvesters, corn-shellers, hay-loaders, automatic unloading-forks, elevators, water-power-, steam-, and gasoline-engines allow great economies. The labor needed to produce food for one hundred people is a fraction of what it was one hundred years ago. In many other industries machines are usable only in a slight measure, indirectly, or not at all. They are of the least assistance in the personal services, and in the work of the thinker, the teacher, the speaker, and the artist.
§ II. EFFECT OF MACHINERY ON THE WELFARE AND WAGES OF THE MASSES
Evil of sudden introduction of machinery