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Source:   An explanation of the works of the tunnel under the Thames from Rotherhithe to Wapping.


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The divisions of the shield are advanced separately and independently of each other, by the means pointed out in the foregoing sketch: each division, as is attempted to be shewn [shown] in the annexed design, has boards in front (known by the technical name of poling boards) supported and kept in position by means of jack screws, which are lodged against the front of the iron frame; these boards are in succession taken down while the earth in front of each is excavated, the first board being always replaced before a second is removed; thus forming a constant firm buttress.

Image ID: 1158873

The divisions of the shield are advanced separately and independently of each other, by the means pointed out in the for... (1836)


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Image Details

Image Title

:  The divisions of the shield are advanced separately and independently of each other, by the means pointed out in the foregoing sketch: each division, as is attempted to be shewn [shown] in the annexed design, has boards in front (known by the technical name of poling boards) supported and kept in position by means of jack screws, which are lodged against the front of the iron frame; these boards are in succession taken down while the earth in front of each is excavated, the first board being always replaced before a second is removed; thus forming a constant firm buttress.

Additional Name(s)

: Thames Tunnel Company -- Author

Medium

: Engravings

Specific Material Type

: Prints

Item/Page/Plate

: Facing page 23

Source

: An explanation of the works of the tunnel under the Thames from Rotherhithe to Wapping.

Source Description

: 24 [i.e.31] p., [9] leaves of plates (some folded) : ill., plan ; 11 x 14 cm.

Location

: Science, Industry and Business Library / Rare Books Division

Catalog Call Number

: VDCP (Thames Tunnel Company, London. Explanation of the works of the tunnel. 1836)

Digital ID

: 1158873

Record ID

: 451264

Digital Item Published

: 2-3-2004; updated 3-25-2011

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