| P number: | P209934 |
|---|---|
| Old photograph number: | A10027 |
| Caption: | Brickworks clay-pit, Warnham Brickworks, Horsham, Sussex. |
| Description: | Looking north-west at Warnham Brickworks clay-pit, 2 1/2 m. north of Horsham. A view of the north face of the pit showing the main working face in 1963. The section being excavated by the mechanical shovel shows 40 to 50 feet of Weald Clay, comprising blue-grey clays and shales, weathered orange-brown within about 15 feet of the ground surface. Some harder bands of calcareous siltstone up to about 1 feet thick occur near the top of the section. They jut out slightly on the weathered face to the left of the shovel. The clay-mineral content of brick clays generally varies from 30 to 50 per cent and for successful firing there should be sufficient fluxing material should be present for the clay to vitrify at a temperature of 950 degrees to 1,100 degrees C, and that there should be an adequate content of a non-plastic constituent, usually quartz, to prevent excessive shrinkage and deformation during firing. In the Weald Clay at Warnham, quartz silt fulfills this last-mentioned function, the intimate mixture of silt and clay, resulting from bioturbation at the time of deposition, making the clay particularly suitable for engineering bricks known as 'Southwater Bricks'. |
| Date taken: | Tue Jan 01 00:00:00 GMT 1963 |
| Photographer: | Pulsford, J.M. |
| Copyright statement: | Crown |
| X longitude/easting: | 517500 |
| Y latitude/northing: | 134500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 299.89 KB; 1000 x 792 pixels; 85 x 67 mm (print at 300 DPI); 265 x 210 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Rocks, sedimentary/ Clay |
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