on the topo
the court house is actually directly across the street to the east of
the building labeled city hall
& its longitude is actually about 2 seconds east of the position i
have been giving & using
oops
tho this relatively slight inaccuracy doesnt alter any of the overall
findings
still could use a finer position
but the somewhat corrected position is
nlat holding steady at 39d39m35s & wlong now 75d33m50s
--- In
BoundaryPoint@yahoogroups.com, aletheia kallos
<aletheiak@y...> wrote:
> 1830 view of new castle waterfront suggests it had
> broader tidal flats than exist today
> upon which a thorofare evidently ran
>
http://bbs.keyhole.com/boards/showthreaded/Board-globalvillag
e-Number-4454-page-11-view-collapsed-sb-5-o--fpart-1.html
>
> indeed this thorofare may well be the same as
> or a successor to
> the long lost
> horse dyke
> on which perry says the original 1701 arc was centered
> & which he depicts in his figure slightly offshore in
> the delaware river as of 1934
> & indicates to have been situated about 2429 feet on a
> bearing of about s18e from the cupola
> http://www.udel.edu/dgs/graphics/IS06FIG2.jpg
>
> on the following map
> the court house is marked city hall
> & the watercolorist would be situated just off battery
> park
> & probably also just south of the frame looking in
> perhaps precisely upon or a bit south &or west of the
> original center point
> which i also make to be slightly south of this frame
> in about 20 feet of water at mean sea level today
> http://topozone.com/map.asp?lat=39.66194&lon=-75.56667
>
> one reason why this hypothetical point of origin still
> remains so hypothetical in my mind
> even with the perry data in hand
> is that an alternative explanation to the abrading &
> lengthening survey chain
> for the regular increase in the radius of the arc
> traveling west to east
> is
> that the true & still unknown point of origin of the
> survey could actually have been situated farther to
> the northeast than anyone has previously supposed
> & still have been on dry land on the horse dyke as of
> 1701
> & that the rate of abrasion & lengthening of the
> chains was not nearly so great as has been previously
> supposed
>
> but i am still playing with the maths that would be
> necessary to advance this idea in earnest
> & thus reverse the supposed direction of the 1701
> survey from counterintuitive eastbound
> back to a seemingly more natural westbound
>
>
>
> & of course a third & completely bogus center point
> also exists & is shown by perry alongside the 2 real
> ones
> & it was created mathematically by graham in 1850 to
> tie the demd arc to the depa arc via the wedge arc
> but that one promises to become of interest only when
> we turn to the west end of depa in pursuit of the
> ghost arcs that predate his mischief
> & which we can still hope hodgkins &or other
> historical sources will illuminate
>
>
>
>
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