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: Chronometers after radio time signals
    From: Alexandre Eremenko
    Date: 2007 Oct 23, 13:31 -0400

    
    One problem is that you never know for sure
    when you buy:-)
    My first Casio watch ($25) run 12 years on the
    original battery, to 10 seconds per year accuracy.
    I used it until the plastic case was brocken.
    The second casio watch (of exactly the same type)
    runs much worse.
    
    Alex
    
    On Tue, 23 Oct 2007, Dan Allen wrote:
    
    >
    > On 23 Oct 2007, at 10:47 AM, Gary LaPook wrote:
    >
    > > I bought a Torgoen dual time zone watch for about $175.00 on
    > > October 12, 2004, three years ago, and, so far, it has gained only
    > > 14 seconds, and the rate has been very consistent.
    >
    > That is almost too good to be true!
    >
    > Do you have a model number for this watch?  Do you know if it is a
    > twin-quartz, or an oversampled quartz movement?  Typical quartz
    > watches run 15 seconds a month, and there are only a very, very few
    > that have these additional technologies which generally improve
    > accuracy to around 15 seconds a year.
    >
    > I have, for example, a certain Seiko SLL033 with the oversampled
    > 176KHz movement good to around 20 seconds a year.  I also have an
    > Omega 1552.30 good to around 15 seconds.  These are hard watches to
    > find, and in addition, they often change movements year to year so
    > you have to really check things out to ensure that you can find a
    > truly accurate watch.
    >
    > I have a Citizen solar powered WR 200 Perpetual Calendar which makes
    > no claims for high accuracy and yet it has given almost the same
    > accuracy.  Quartz watches are affected by temperatures and sometimes
    > if you have a watch at a constant temperature the randomness cancels
    > and you get high accuracy, but it is not guaranteed across different
    > examples of the same watch.
    >
    > Dan
    >
    >
    > >
    >
    
    
    --~--~---------~--~----~------------~-------~--~----~
    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