Rainey's Improved Abacus: An Explanatory Treatise on the Theory and Practice of Arithmetic and Mensuration; In Which the General Principles Involved in Practical Calculations Are Thoroughly Elucidated and Illustrated by Numerous Analytic and Abbreviated E

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1kg Limited, Oct 27, 2017 - History - 332 pages
Excerpt from Rainey's Improved Abacus: An Explanatory Treatise on the Theory and Practice of Arithmetic and Mensuration; In Which the General Principles Involved in Practical Calculations Are Thoroughly Elucidated and Illustrated by Numerous Analytic and Abbreviated Examples

No secondary principle has been used in the elucidation or illustration of one that is primary; nor has any princi ple been anticipated; but each, used in its natural sequence, has been made the basis of a yet higher principle, in such manner, as to cultivate the reasoning powers of the learner, saith out embarrassing than.

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