§ I. EXTENT OF THE USE OF MACHINERY [Sidenote: Tools, machines, and power] 1. _A machine is a mechanical device by which power is applied in an automatically repeated manner, to change the place or form of things._ It is not easy, perhaps not important, to distinguish the machine from the tool in every case. Tools are portions of matter, such as bone, wood, iron, which man guides and directs in applying his energy to things. A machine may be used by the foot, but the hand is the great tool-using member. In many cases there is a clearly marked distinction between tool and machine. A simple, single piece that can be taken into the hand, as a spade, a hammer, a knife, is a tool; a combination of wheels, levers, pulleys, etc., is a machine. The simplest machine is but a slight adaptation of the tool, by which power may be applied in an automatically repeated manner. The drag develops into the cart, a simple machine. The spinning-stick, a tool used in ancient times, developed into the Saxon spinning-wheel of the sixteenth century, the form used when America was colonized. The use of power derived from nature, as that of wind and water and steam, while not the essential mark of machines, is the most characteristic feature of their modern development. Hand-machines, such as the hand-press and the type-writer, have had important industrial results, but it is the use of power leading to the concentration of industry and the ownership of machinery by the employers that has the greatest significance in the modern economic problem. [Sidenote: Machinery brought in an industrial revolution]