Orton's Lightning Calculator: And Accountant's Assistant (Classic Reprint)

Quantities are of two essential kinds, Geometrical and Physical. 1. Geometrical quantities are those which occupy space; as lines, surfaces, solids, liquids, gases, etc. 2. Physical quantities are those which exist in the time, but occupy no space; they are known by their character and action upon geometrical quantities, as attraction, light, heat, electricity and magnetism, colors, force, power, etc. To obtain the magnitude of a quantity we compare it with a part of the same; this part is imprinted in our mind as a unit, by which the whole is measured and conceived.
(Typographical errors above are due to OCR software and don't occur in the book.)

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