ABSTRACT
For multiplying or dividing a great many times by the same number, there is no device hitherto invented which is superior to a table of logarithms. The use of logarithms does not require a knowledge of the higher mathematics. It is purely an arithmetical help. The popular prejudice to the effect that there is something mysterious or occult about logarithms has no foundation. The ordinary books of logarithms are calculated to 7 places of decimals, sometimes extended for certain numbers to 8. If one wished to multiply by 1.03 fifty times, the logarithm would give them the first seven figures only of the answer, but as the remaining figures are so very insignificant, the result will for most questions be near enough even if rounded off at the 6th place. All the books of logarithmic tables contain, in an introduction, rules for using the tables, and these should be studied, and the examples worked out.
