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 quantity of meaning compressed into small space by algebraic signs, is another circumstance that facilitates the reasonings we are accustomed to carry on by their aid.
Charles BabbageA young man passes from our public schools to the universities, ignorant almost of the elements of every branch of useful knowledge.
Charles Babbage