Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: Fairchild A-10
    From: David Pike
    Date: 2017 Jul 2, 23:56 -0700

    The A-10A added a a very primitive escapement that sent a pulse to a relay which then sent a pulse to a solenoid that pushed that pencil lead to make a mark on the disk. In use you hold down a trigger and the averager sends a pulse every second to the solenoid so 120 marks in two minutes. Then center the marks agains the pencil lead and read out the altitude..

    So that means they had to start at one end and without disturbing the paper disc count up to 61 and mark the 61st mark a bit bolder (or just move the marks against the resting pencil lead until they’d counted 61). Wow! I’d lose count. Is there a mathematical proof to say that the median value also corresponds with mid-time other than saying that if you have 121 equi-timed marks the median has 60 equal time periods on either side?  I'll put some batteries in mine and see if it works any better.  DaveP

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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