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    Re: Martelli's Time-Sight Tables
    From: Doug MacPherson
    Date: 2012 Dec 23, 07:51 -0800

    I ordered a copy from India by way of ABE books online. I will let you know how it turns out. 
    
    Doug 
    
    
    
    Sent from my iPhone
    
    On Dec 22, 2012, at 7:12 PM, Hewitt  wrote:
    
    > 
    > I ordered this book from Amazon and it came yesterday. Full title is "Short, 
    easy, and improved method of finding the apparent time at the ship."
    > 
    > It's a trade paperback, and I have to say Hewlet-Packard made a nice job of 
    it. The signatures are stitched, so they shouldn't come loose. The only 
    shortcoming with my copy is the print on page 42 and pages 44 thru 47 of 
    Table V is light (but still quite legible).
    > 
    > The tables are I thru VI and the method takes them in that order. What you 
    end up with is LHA expressed in time units, so you have to convert to the 
    angular units we are used to- 1 hour = 15*, 4 mins = 1* ...
    > 
    > After working through his English example (the same data is used for 
    directions in French, German, Italian and Spanish), I ran the example through 
    my HP 35s using the sine/cosine formula and it gave an answer 1.0' less than 
    Martelli.
    > 
    > Then I tried M's table with Greg's 12-17 time sight and again the difference was 1.0'. 
    > 
    > My 1972 Bowditch noted that Martelli's method was still popular. Having been 
    an active navigator then having tried it now, I can see why. There are 6 
    tables, but they are short and logical. In neither of the cases I tried did I 
    have to do an interpolation.
    > 
    > My one cavil is to wish M had set out the formulas he used. I have the same 
    gripe about the Concise SR table in the NA. 
    > 
    > Net of everything, though, Martelli's book is an agreeable stocking stuffer for myself.
    > 
    > Hewitt
    > 
    > 
    > Sent from my iPad
    > 
    
    
    
    

       
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