John W. NystromJohn W. Nystrom (1824-1885) was an American inventor and author known for his contributions to the field of arithmetic and measurement systems. His work on the tonal system proposed a new way of approaching arithmetic, weights, measures, and coins, wth a focus on simplicity and efficiency. Nystrom's innovative ideas and inventions, including the Nystrom's Calculator, have left a lasting impact on mathematical practices and calculations. Read More Read Less
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