The dimple in the middle of the bronze disc is the actual intended tripoint.
The surveyor would have aligned it as precisely as possible with the point of
his plumb bob. The triangular and T-shaped lines spreading from it were then
placed by hand with die and hammer, not measured for accuracy. They are general
graphic indications, much like blazes on trees. Notice how the lettering of
"UCOLWY," "1931," and the state names are also hand-died and not very neat.
Lowell G. McManus
Leesville, Louisiana, USA
----- Original Message -----
From: "aletheiak" <aletheiak@...>
To: <BoundaryPoint@yahoogroups.com>
Sent: Saturday, September 04, 2004 6:11 AM
Subject: [BoundaryPoint] 2 different tripoint positions a few mm apart
>
> --- In BoundaryPoint@yahoogroups.com, Michael Kaufman
> <mikekaufman79@y...> wrote:
> > 2 TPs a few millimeters apart?
>
> http://www.public.asu.edu/~redsall/triplepoints/june2004/19.htm
> > > the marker is unusual in indicating 2 distinctly
> > > different tripoint
> > > positions a few millimeters apart
> > > tho both are coverable with a single touch of an
> > > index finger
>
> focusing closely on the 2 different die stamps that appear in the
> approximate center of the 1931 glo disk marker
> if you compare the point formed by the middle of the hole in the
> triangle with the point formed albeit implicitly by the tee junction
> you will notice that they do indeed fall several millimeters apart
>
> & tho that was fine & probably even went unnoticed in 1931
> given the present state of survey art in 5 or 6 decimal digits of
> degminsec &or statute feet
> which equates to submillimetric accuracy
> these 2 positions would today be acknowledged & expressed as
> 2 different geodetic points
>
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