- #1

Thecla

- 132

- 10

I wondered how did Briggs create a log table 400 years ago? How did he find the logarithm of 7(base 10)?

I looked around the internet and You Tube and most sites show how to use logs in multiplication, division and finding roots, but not much on creating a table. I think i know why creating a table is not a point of discussion.

I found a paper on the internet by Denis Roegel (2010):

"A reconstruction of the Tables of Briggs'Arithmetica Logarithmica"

I only read the first two pages because the math is beyond me

Briggs' log table covered the numbers from 1 to 20,000 and 90,001 to 100,000 to 14 decimal places.How did he do it?

He did it by taking multiple roots of 10

log 10=1

log 10^.5=.5

log10^.25=.25

Down to log 10^(.5^54)=.5^54

The author states that Briggs was aided by computers{people} but no names were mentioned.

What a tremendous undertaking this was. As somebody said you only have to do this once and for hundreds of years it saved so much time. Simon Laplace, a 19th century scientist, said that what took months of arithmetical calculations could now be done in a few days.