Publisher's Synopsis
Excerpt from The Calculator's Constant Companion, for Practical Men, Machinists, Mechanics, and Engineers
Labour-saving machinery is a leading feature of the' present time; the amount of labouring force exerted by a machine operated by the force of steam, water, air, or other motor, can be measured in each particular case with the greatest nicety, but there is no unit by which mental labor is measured. However, economy in mental labor is as de sirable as in physical labor. The discovery of logarithms saved as much mental labor, as the introduction of steam did physical. The table I now lay before the public, the result of calculations, termed The Calculator's Constant Companion, is only second to a table of logarithms as a mental labor-saving machine. By the use of this table I was enabled, during the past twenty years, to make more calculations than any one man that has gone before me, which I have m a great measure made public. The number of purposes to which this table may be applied, to save the labor of calculating, are without limit, but from the following suitable examples of its use, the mode of application in every possible case becomes easy.
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