SJ4065 : 1GL Bench mark and bolt on Grosvenor Bridge

taken 10 years ago, near to Handbridge, Cheshire, Great Britain

1GL Bench mark and bolt on Grosvenor Bridge
1GL Bench mark and bolt on Grosvenor Bridge
This benchmark is in the exact centre of the west face on the east side of Grosvenor Bridge, and just to the right of the horizontal line are the remains of a bolt. The website LinkExternal link records that the bolt was used as part of the Ordnance Survey's First Primary Levelling on the line between Warrington and Pembroke Docks, between September 1851 and July 1852. The benchmark was, therefore, cut long before the lamp was installed, and the protruding base of the lamp cluster might have made it difficult for a surveying staff to be held vertically at this point. Nevertheless, the Ordnance Survey database shows that the mark was checked visually and was levelled in 1965. The name plate on the base of the lamp structure is 'Revo Tipton', a company who specialised in street lighting between the 1930s and 1970s, so it is possible that the lamp was only installed after the last levelling in 1965. The lamp itself is seen at SJ4065 : Grosvenor Bridge Lamp Cluster.
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SJ4065, 1055 images   (more nearby )
Photographer
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Date Taken
Wednesday, 14 March, 2007   (more nearby)
Submitted
Friday, 16 March, 2007
Category
Bench Mark   (more nearby)
Subject Location
OSGB36: geotagged! SJ 402 655 [100m precision]
WGS84: 53:11.0204N 2:53.7518W
Camera Location
OSGB36: geotagged! SJ 402 655
View Direction
EAST (about 90 degrees)
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