Page:The Construction of the Wonderful Canon of Logarithms.djvu/122

98 Notes.

In the description of the third method, on pages 53-54, it is explained that when log. 1 = 0 and log. 10 is assumed equal to unit with a number of cyphers annexed, a close approximation to the logarithm of any given number may be obtained by finding the number of places in the result produced by raising the given number to a power equal to the assumed logarithm of 10, As an example, Napier mentions that, assuming log. 10