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 Enowrote: > > 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 > > > > > > ____________________________________________________________________________________ Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---