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By 1888, the southern shore of the island had been washed out and the sourthern base line station monument was lost. By 1888, the southern shore of the island had been washed out and the southern base line station monument was lost.

Kent Island Base Line (1842-1844)

The Kent Island base line was originally measured when triangulation was brought from Fire Island in New York to the Chesapeake Bay and the District of Columbia. It was also used as a basis for the measurement of Chesapeake Bay, and when the Transcontinental Triangulation project was initiated in 1871, the Kent Island base line was already situated near the 39th parallel and was incorporated into the network.

The measurement was supervised by [http://www.photolib.noaa.gov/historic/c&gs/images/big/theb3455.jpg James Ferguson], Assistant of the Coast Survey, and occured between May 3 and June 5, 1844, and was performed by means of iron bars supported by 8-meter boxes. The line was measured just once, and required 1,086 repositionings. The line length was computed to be 8,687.5446 meters, +/- 6.80 cm, reduced to sea level.

By 1888, the southern shore of the island had been washed out and the southern base line station monument was lost.

See also: [:TranscontinentalTriangulation:transcontinental triangulation], [:EasternShoreSeries:Eastern Shore series], [:AlleghenySeries:Allegheny series]


http:/images/bmwiki/arc/kent_island.jpg

No.

Station

PID

Monumented

Destroyed

Designation

1

North Base (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=HV6156 HV6156]

1947

KENT ISLAND NORTH BASE RESET

2

South Base (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=HV6177 HV6177]

1844

Y

KENT IS SOUTH BASE 1844

3

Marriott (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=HV7199 HV7199]

1844

MARRIOTT

4

Webb (1846)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=JV5810 JV5810]

1896

WEBB

5

Finlay (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=JV5442 JV5442]

1844

Y

FINLAY 1844

6

Poole's Island (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=JV5354 JV5354]

1844

POOLES ISLAND 1844

7

Swan Point (1842)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=JV5152 JV5152]

1848

SWAN POINT 1848

8

Linstid (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=JV5231 JV5231]

1844

LINSTID RESET

9

Taylor (1844)

[http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=HV6325 HV6325]

1847

TAYLOR RESET

KentIslandBaseLine (last edited 2009-03-21 21:03:18 by localhost)