Question: how are log tables calculated?
Answer: To obtain the Briggs or base 10 table, the calculation would be continued until X exceeded 10 and then the L scale adjusted so that at X = 10, L = 1.In addition to the discrete series procedure, Napier and Briggs suggested the calculation of logarithms by extracting roots of 10; i.e., log 10 = 0.5, log 101/4 = 0.25.