| | Greenwich Industrial History Society, Issue 27 |
 | | In both tunnels the technical problems of driving a horizontal shaft through mixed water-bearing strata had to be overcome by using compressed air to restrain water penetration and in addition this was partially slowed by a temporary sealing layer of clay on the river-bed. |
 | | As recorded by the LCC the foot tunnel is 1217 ft in length external diameter 12'9", internal 11'0" and it was formed with cast-iron segments bolted together, lined with concrete and faced with white glazed tiles. |
 | | In Greenwich Local History Library at Woodlands, comparative tunnelling methods are described in a paper read at the Institution of Civil Engineers in 1902 - see: ICE minutes for 25 March 1902 pp 1-24, from which these illustrations of the Greenwich Foot Tunnel are reproduced with due acknowledgement of library staff assistance. |
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