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@...> 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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