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    Re: How does the AstraIIIb split mirror work?
    From: Joel Jacobs
    Date: 2004 Apr 24, 06:48 -0400

    Thanks Jim,
    
    Since the horizon mirror is back surfaced, it would appear that all previous
    arguments are in order.
    
    Joel Jacobs
    
    ----- Original Message -----
    From: "Jim Thompson" 
    To: 
    Sent: Friday, April 23, 2004 9:32 PM
    Subject: Re: How does the AstraIIIb split mirror work?
    
    
    > > -----Original Message-----
    > > From: Joel Jacobs
    > > A question for Jim T., is one or both of your mirrors front or back
    > > silvered.
    >
    > Index mirror is front-silvered.
    > Horizon mirror is back-silvered.
    >
    > I checked my sextant, but see also
    > http://celestaire.com/catalog/Marine_Sextants/Astra_IIIB/
    >
    > Jim
    
    
    

       
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