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    Re: H.O. 249 when introduced
    From: Ken Gebhart
    Date: 2002 Mar 8, 22:52 -0600

      In answer to the question of when HO-249 tables were first published, I
    have dug up the following bibliography:
    
    Aircraft Navigation Manual (HO-216) - 1941- says that HO-208, HO-211, and
    HO-214 are the only tables used for sight reduction.
    
    Air Navigation - P.V.H. Weems- 1943- says that HO-214 and (pushing their own
    product, Weems Line of Position Book),  are the main methods used for air
    navigation.  They mention that the RAF Air Navigation Tables (A.N.T.) are
    published in the US as HO-218, with no further explanation.
    
    Air Navigation- Army Air Force - 1944- says HO-218 is the primary means of
    air sight reduction.  It says HO-218 has HC values listed with respect to LHA
    Star and DR Lat. for 22 "selected stars". These exist in the first half of
    each volume, with the last half being like HO-214.  Each volume covered 5 deg
    of Lat.
    
    Duttons- Tenth Edition -1951-  mentions that HO-218 and HO-249 are similar to
    HO-214 in many ways.  So, this is the first mention I could find for HO-249.
    It looks like in the 7 years between 1944 and 1951 someone took the selected
    stars from 218 and incorporated them into one volume 1 of HO-249.
    
    Maybe someone else has additional references that can pinpoint the first
    HO-249.
    
    Ken Gebhart
    
    
    Cliff Sojourner wrote:
    
    > From: "daveweilacher---.net" 
    > > Does anyone know when H.O. 249 tables were introduced?
    >
    > Hi Dave,
    >
    > all I could find quickly is, according to Bowditch (page 8, section 111)
    >
    > > In 1936 the first volume of Pub. No. 214 was made available; later, Pub.
    > No. 249 was provided for air navigators.
    > > Pub. No. 229, Sight Reduction Tables for Marine Navigation, has replaced
    > Pub. No. 214.
    >
    > I would guess all three HO 249 volumes were published at the same time.
    >
    > --
    > these are the good old days
    > Cliff Sojourner          cls{at}employees.org
    
    
    

       
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