Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: napier and logarithms
    From: Michael Dorl
    Date: 2009 May 28, 08:16 -0500

    corallina wrote:
    > I finished reading "The Story of Numbers" by John McLeish
    > chapter 12 is about Napier.  Unfortunately there is no mention
    > of Briggs.
    >
    > On page 171 there is a description of how Napier calculated the logarithm
    > of 2.  He raised 2 to the power of 10,000 which comes out to a
    > number of 3011 places. He then subtract 1 from 3011 and gets 3010
    > which is the logarithm of two good to 4 decimal places.  log10(2) = 0.3010
    > I really don't understand why this works and hope somebody can
    > explain it?
    >
    
    log (2**10000) = log ((10**0.30103)**10000) = log(10**3010.3)=3010.3
    
    I still recall my calculus teacher telling us how he remembers log 2.
    He thought of it as the ears, nose, and eyes of a face.  You have to
    reverse the right ear though.
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site