Thacher's Calculating Instrument or Cylindrical Slide-Rule

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From the PREFACE. The ordinary slide-rule, or Gunter's scale, invented many years ago, for approximation or a rough check on ordinary calculation, has been found of great utility. It is, however, unfitted for the more exact calculations of the engineer, architect, and actuary, and does not satisfy all the requirements of scientific investigation or of financial transactions. The value of the slide-rule as a calculator depends upon the accuracy of its results, upon the rapidity with which those results can be found, upon ...

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