P530880

Uploaded on:
11/03/2009 02:37:52
Type:
Digital Asset
File Size:
202.62 KB
Dimensions:
1000 x 659 pixels
3263 views 4 downloads
P number: P530880
Caption: Detail of wall outside St. Mary's Cathedral, Leith Street, Edinburgh, Lothian Region.
Description: The image shows the base of a retaining wall which is clad in a pale yellow-buff sandstone. The stone has a series of dark markings along its base and a variable white staining or 'bloom' caused by salt crystallization. Salt damage is one of the principle causes of building stone decay in sandstones; the force of the expanding salt crystals exerting great pressure within the pore spaces in the rock resulting in disaggregation of the original sand grains. Sandstones are bound together by a natural matrix cement which is composed of several mineral types such as silica, calcite and iron oxide.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 202.62 KB; 1000 x 659 pixels; 85 x 56 mm (print at 300 DPI); 265 x 174 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Best of BGS Images/ Stone and the built heritage (Building Britain)  

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