The ancient "dew ponds" of England have theiT modorn counterparts on tho Hock of Gibraltar, where drinking water is obtained by the condensation of tho abundant dew in specially-prepared basins. The primitive prooess consists in making a hollow in tho ground and filling tho bottom with dry straw, over which is placed a layer of clay. On a clear night tho clay cools very rapidly, and the (low is condensed into water in tho basin. The pond is improved by putting a. layer of asphalt on Portland wruoufc under the. straw. At, Gibraltar (he pratpiit pnwt.ioe \f lo use we<3 uiMftid of anil ihost ism instead of oUj.
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https://paperspast.natlib.govt.nz/newspapers/DOM19120217.2.130.2
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Dominion, Volume 5, Issue 1366, 17 February 1912, Page 16
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108Page 16 Advertisements Column 2 Dominion, Volume 5, Issue 1366, 17 February 1912, Page 16
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