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Article 309 of Bowditch (1962 & 1977 ed)

" Transverse Mercator Projection- a special case of the Mercator
projection in which the cylinder is tangent along a meridian is called a
transverse (inverse) Mercator ..."

You won't find this in the current Bowditch. It is also article 209 of
H.O. 216 (1967).

gl
Brad Morris wrote:
>
> I am reading the "Army Observer's Report of Operation Highjump", Task
> Force 68 US Navy.
>
> Of the navigation reported, the observer reports
> 1) Beacon Navigation. Homing to the runway by a beacon.
> 2) Use of the astral or sun compass
> 3) Magnetic compass
> a) For the LVT (ground expedition). Observer states not adequate due
> to swing or oscillation of the compass needle.
> b) For air navigation, the observer states that the compass, with known
> variations provided an ability for "a fairly good course"
> 4) Sun Lines of Position!
>
> There is a reference to an "Inverse Grid Magrader" chart and an
> "inverse grid computer". I would suspect the inverse grid computer to
> be some type of slide rule. My question is about the Inverse Grid
> Magrader chart. Has anyone heard of this before? Internet searches
> yield no help. Could it be that the Army Observer transliterated
> Mercator to Magrader?
>
> A little help would be appreciated!
>
> Best Regards
> Brad
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