ST9910 : Bench Mark, All Saints Church

taken 7 years ago, near to Gussage All Saints, Dorset, Great Britain

Bench Mark, All Saints Church
Bench Mark, All Saints Church
The bench mark is to be found on the southeast angle of the church tower. For a view of the church ST9910 : All Saints Church, Gussage All Saints and for more information on the cut mark LinkExternal link
A bench mark is an Ordnance Survey arrowhead sign found on walls, bridges, churches and specially erected triangulation pillars where the altitude above sea-level has been accurately measured by surveyors. The arrowhead points to a horizontal line above it which marks the exact altitude.
With rivets and pivots there is no datum (horizontal line) cut, the pointed-to horizontal surface defining the datum height.

Lichens do not have roots, but absorb water and gases through their upper surface, and are therefore sensitive to atmospheric pollution. For this reason they are rarely found around cities and grow best on the wetter west side of the British Isles. Those on trees thrive best on the sunny, south-west aspects of trunks and branches. Disappearance of lichen species can be used to detect rising levels of air pollution.

There are three main types. The encrusting forms, including the bright orange/dark yellow 'Xanthoria' grow on roofs, walls, gravestones, signs and tree trunks. Leaf-like species develop flat lobes spreading over bark or stones, and shrubby forms which grow vertically from the ground or hang from trees. Few have common names.
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ST9910, 69 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Tuesday, 8 June, 2010   (more nearby)
Submitted
Wednesday, 30 June, 2010
Category
Bench Mark   (more nearby)
Subject Location
OSGB36: geotagged! ST 9984 1081 [10m precision]
WGS84: 50:53.8062N 2:0.2187W
Camera Location
OSGB36: geotagged! ST 9984 1081
View Direction
Northwest (about 315 degrees)
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