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: Double vial horizon prototype
    From: Patrick Goold
    Date: 2012 Jan 11, 21:16 -0500
    Bill,
    Could you describe the way to level a theodolite "systematically"?  I am sure I am wasting some motion in the way I do it.

    Patrick

    On Wed, Jan 11, 2012 at 8:28 PM, Bill Morris <engineer@clear.net.nz> wrote:

    Geoffrey

    "For the avoidance of doubt" (no, I'm not a lawyer!)a ten second level nowadays means that for 10 seconds of tilt, the bubble moves through one 2.5 mm (formerly 1/10th inch)division. The plate level of my Wild T2 theodolite, which reads to single seconds, is of 20 seconds sensitivity and that for the vertical circle is effectively of 15 seconds sensitivity. With fine-pitch levelling screws from which any tendency to wobble has been removed, it is the work of a couple of minutes to level a mirror, provided one approaches the task systematically.

    Bill Morris
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------




    --
    Dr. Patrick Goold
    Department of Philosophy
    Virginia Wesleyan College
    Norfolk, VA 23502
    757 455 3357


       
    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