ahh in that case i think what you probably have there is an older
undimpled tri town monument
on which the position of the tripoint can nevertheless still be
inferred as the center of the top face
assuming the rock is still fully erect
& it seems this rock has subsequently attracted a disc marker
from a survey which
tho its specific purpose is admittedly unclear
cant just be presumed to trump & displace the center of the
stone for most authoritative tripoint position
& this even in the teeth of the fact that that center is bare
but more to the point might be to learn what the essex county
street line per se is
or what kind of commission attached the disc to the rock
etc
--- In
BoundaryPoint@yahoogroups.com, Michael Kaufman
<mikekaufman79@y...> wrote:
> Ok, with my last post in mind...
> The disc is not at the center of the marker (it is
> really quite far off from center). Note: the disc
> says "Essex County Street Line" and no real crosshairs
> or lines, just a small hole (but not like dimples I've
> seen on other markers)
> So would the tp be the center of the marker as seen
> from above or the center of the disc which is off to
> one side of the marker?
> I'll try to post a pic soon to make it easier to
> visualize...
>
> --- acroorca2002 <orc@o...> wrote:
> > & more likely
> > & especially in recent centuries
> > any dimple or crosshairs etc was already scribed at
> > the exact center
> > of the monument or disc by the manufacturer
> > so the surveyor wouldnt have to do this for himself
> >
> > --- In BoundaryPoint@yahoogroups.com, "Lowell G.
> > McManus"
> > <mcmanus71496@m...> wrote:
> > > Michael Kaufman asked:
> > >
> > > > ...My question is
> > > > this: Is the exact tripoint
> > > > 1. the middle of the marker?
> > > > 2. the county placed disc?
> > > > 3. the dimple?
> > > > And HOW would we know? I would assume there
> > can't be
> > > > too much official paperwork on 4th-level
> > boundaries.
> > > > But maybe some general set of guidelines
> > somewhere?
> > >
> > > The dimple! It was likely put there by the
> > surveyor using a hammer
> > and die to
> > > mark the exact point on the disc where the point
> > of the plumb bob
> > hanging from
> > > his transit came to rest. Any subsequent surveyor
> > who measures
> > from the
> > > monument will center his transit's plumb bob over
> > the same dimple.
> > >
> > > Lowell G. McManus
> > > Leesville, Louisiana, USA
> >
> >
>
>
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