A tool is usually more simple than a machine; it is generally used with the hand, whilst a machine is frequently moved by animal or steam power.
Charles BabbageThe fatigue produced on the muscles of the human frame does not altogether depend on the actual force employed in each effort, but partly on the frequency with which it is exerted.
Charles BabbageIt is difficult to estimate the misery inflicted upon thousands of persons, and the absolute pecuniary penalty imposed upon multitudes of intellectual workers by the loss of their time, destroyed by organ-grinders and other similar nuisances.
Charles Babbage