NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Hughes Tables
From: N S Gurnell
Date: 2007 Jun 3, 10:52 -0700
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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