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Subject = "Liberton"
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Alnwick Hill filter beds, cleaning sand
Bell, J. Munro, 1890, Engraving
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Alnwick Hill filter beds, cleaning sand
Alnwick Hill filter beds, cleaning sand
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Category
Library Item
Item no
30409
Title
Alnwick Hill filter beds, cleaning sand
Artist / maker
Bell, J. Munro
Date
1890
Size
9.0 x 14.5 cm
Type
Engraving
Location
Edinburgh and Scottish Collection
Bailie James Colston felt that the filters which served reservoirs were important enough to give an overview of their construction in his book 'Edinburgh and District Water Supply.' '..the ground was excavated...to the depth of 12.5 feet, and the bottoms and sides of the beds made perfectly water-tight by means of clay puddle. Over the bottom part of the bed there were placed three inches of carefully watched sand: and over that there was a layer of three inches of fine screened gravel. Passing down the centre, along the whole length of the beds is a drain of dry mason work to carry off the filtered water. Over the three inches of gravel already mentioned there is a bed of gravel of coarser quality from 1 foot 6 inches to 3 ft 6 inches in depth, the upper surface being formed in ridges and furrows. There is then a layer of 6 inches of fine gravel...then a layer of 6 inches of sea shells. Again there is a layer of coarse sand, and the whole is finished by another layer of 18 inches of the finest sand by means which the process of filtration is carried on. It need not be added that the filtering material requires to be most carefully washed before being put into its place: and the upper stratum requires to be perfectly cleaned', (p. 85 from the bound volume, 'The Edinburgh and District Water Supply, a historical sketch').
This image is an engraving of an original photograph by
Alexander Leslie C.E.
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Reservoirs of Edinburgh
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Liberton
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