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: Automated Sun detector
    From: Geoffrey Kolbe
    Date: 2007 Dec 09, 14:56 +0000

    
    Richard wrote [NavList 4269]
    
    >About fifty years ago I had a summer job at an agricultural research
    >station.  One apparatus was basically a crystal ball on a stand, "burning"
    >a path for the day on a tilted half cylinder of paper.  I think the paper
    >automatically notched upward each night . . . but it has been quite a long
    >time ago for all the details.  Cloudy sky didn't make a good mark, but
    >bright sun was clearly evident.  Seemed like a simple way to get the
    >number of sunshine hours at a given location.
    
    The Campbell-Stokes sunshine recorder to which Richard refers was invented
    back in 1835 and is still on the standard list of meteorology equipment.
    Brand new, they cost some thousands of dollars and pretty much the same in
    pounds. But glass balls of a good size can be had at a reasonable price,
    see http://www.mineralcraft.com/acatalog/Glass_Spheres.html and the special
    card on which the sunshine hours are recorded can be obtained from
    http://www.fairmountweather.com/products_bottom.php?cat=3&pid=15
    
    A frame to hold it all together should make a nice little project. I think
    Mike could probably have his very own automated sun detector with change
    out of thirty quid!
    
    Geoffrey Kolbe
    
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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