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    Re: Hughes Tables
    From: N S Gurnell
    Date: 2007 Jun 3, 10:52 -0700

          Hi Robert,
          I'm on the Wet Coast
                Here are contents;-
    
    Preface etc,v
    Explanation,  .....X
    Table IV-  Four Figure Logarithms    130
    Table V-  Mer. Parts                          134
    Table  VI--Traverse Table                  142
    Table  Vii- Course Correction Table   165
    Table  VIII- Ratio of Ground Speed to Air Speed   166
    Table  IX   - Track Errors for Distance off Required Track   168
    Table X   - Conversion Angle                 169  ( GC courses to rhumb line}
    Table XI  - Conversion of Arc to Time     170
    Tables XII - XVii Altitude Correction Tables  171
        Table XII Dip, Mean Refraction & Parallax  171
         Table XIII-  Correction of Observed Altitude of Sun's Limb    172
        Table XIV - Correction of Observrd Altude of Moon's Limb     174
         Table XV -  Correction of Mean Refraction                             178
         Table XVI -  Moon's Parallax in Altitude
    180
          Table XVII - Bubble Sextant Refraction
    182 (up to 10500 meters)
    
    Same Size as Nautical Almanac.
    Cheers, nsg.
    --- Robert Eno  wrote:
    
    >
    > Thanks NS.
    >
    > I take it that they were more than just sight reduction tables?
    >
    > I am reading a book about air navigators (mostly from the old days when they
    > still relied on sextants) and several of the men who related their stories
    > expressed a preference for the Hughes Tables because they are/were compact
    > and fast.
    >
    > 400 plus pages doesn't seem very compact to me but I guess it is all
    > relative. I have been toying with the idea of purchasing a copy on the 'net
    > but the $85. price tag is deterring me. I may yet break down.....
    >
    > cheers,
    >
    > Robert
    >
    >
    > ----- Original Message -----
    > From: "n s gurnell" 
    > To: 
    > Cc: 
    > Sent: Saturday, June 02, 2007 7:23 PM
    > Subject: [NavList 2932] Re: Hughes Tables
    >
    >
    > >
    > > Hi  Robert.
    > >                  I was a Navigator in the '40's and 50's and used them.
    > > Here are quotations from my 1943 copy:-
    > >   "Compiled by L. J. COMRIE, M.A., PH.D., Late Superintendent, H.M.
    > > Nautical
    > > Almanac Office.
    > >
    > > Preface    These tables came into being as the result of suggestions put
    > > forward by Lt. Com. P.V.H. Weems, U.S.N.  (Retired during his visit to
    > > England
    > > in 1936...
    > >   One particular source of encouragement was the fact that a chapter of
    > > thee
    > > new edition of THE ADMIRALTY NAVIGATION MANUAL  was devoted entirely to a
    > > description of the tables.  ...
    > >     It must be made clear that the only originality claimed in the three
    > > main
    > > tables (I, ii and iii) is that of arrangement, typography, accuracy and
    > > explanation.  These same figures can in other places, but not in one place
    > > , or
    > > with a single latitude on each page.   not exceding the ALMANAC in bulk,
    > > inexpensive , and yet affording equally well the saving that follows the
    > > use of
    > > an assumed position or the advantages  of a dead reckoning position when
    > > required.  ...
    > > it has proved fortunate that the requirements of sea and air navigation
    > > have
    > > not conflicted, and so can be met in a single volume, without detriment to
    > > either.  ..  the U.S. NAVY,  who generously gave permission to utilise
    > > material
    > > in U.S. HYDROGRAPHIC OFFICE PUBLICATIONS Nos. 208 and 211."
    > >
    > > On a nice morning in the tropics I could usually manage to take five or
    > > six
    > > sights before sunrise and have a position on the chart and down for a
    > > shower
    > > before 7am.. Of course in those days there was nothing but pencil or pen
    > > and
    > > paper and we didn't get too fancy with a cocked hat.  They gave you all
    > > your
    > > information and were good for all seas from Milford Sound N.Z. to
    > > Yokohama, L.A
    > > .  Villefranche and Oslo wthout crushing too many crabs.  I bought my
    > > present
    > > copy in Halifax, N.S. about 1978, after presenting my original to a
    > > yachting
    > > lawyer in lieu of his fee.  Cheers, nsg
    >
    >
    >
    > >
    >
    
    
    
    
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