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Historic England Research Records

Monument Number 1413672

Hob Uid: 1413672
Location :
Kent
Dover
Hougham Without
Grid Ref : TR2716838601
Summary : An Early Twentieth Century sound mirror was constructed at Abbot's Cliff in 1928 and is still extant on aerial photographs taken in 2007. A contemporary building platform is visible as an earthwork on aerial photographs taken in 2007. An associated antenna is located 190 metres to the west, and is recorded as (NMR: 1534419). Two possibly associated buildings and a possible property boundary are located 12 metres to the east (NMR: 1534413). This 20ft (6.1m) mirror was built as one of a pair of mirrors to bracket the Acoustic Research Station at Hythe, the second mirror being located at Denge (NMR: 462809). This site has been mapped from aerial photographs as part of the South East Rapid Coastal Zone Assessment Survey NMP (Component 2).
More information : The mirror comprised a free-standing square block of concrete containing a shallow, concave dish 20ft (6.16m) in diameter. There is a separate rectangular concrete base at the back of the mirror and a small concrete apron in front. It is one of only five acoustic mirrors surviving in Kent. (1)

A sound mirror located at Abbot's Cliff (TR 270 388) built in 1928. Sound mirrors were designed to provide early warning of approaching enemy aircraft by detecting the sound of their engine over long distances. This 20ft (6.1m) mirror was built as one of a pair of mirrors to bracket the Acoustic Research Station at Hythe, the second mirror being located at Denge. The mirror could have been in use up until the 1930s when sound mirrors were replaced by radar technology. (2)

An Early Twentieth Century sound mirror was constructed at Abbot's Cliff in 1928 and is still extant on aerial photographs taken in 2007. The sound mirror is as described above by authorities 1 and 2. A contemporary building platform is visible as an earthwork on aerial photographs taken in 2007. The building is centred on TR 27159 38599 and comprises a rectilinear enclosure defined by a broad bank which could be composed of the rubble of collapsed walls. This defines a building which measures 13 metres long by 8 metres wide. The building extends on a NW-SE orientation, along the edge of the cliff. A ground based photograph shows a timber hut at this location, related to the operation of the sound mirror.

An associated antenna is located 190 metres to the west, and is recorded as (NMR: 1534419). Two possibly associated buildings and a possible property boundary are located 12 metres to the east (NMR: 1534413). This site has been mapped from aerial photographs as part of the South East Rapid Coastal Zone Assessment Survey NMP (Component 2) (3-4).

Sources :
Source Number : 1
Source : Kent's Defence Heritage
Source details : Gazetteer Part 1, KD157
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Source Number : 2
Source : Twentieth century fortifications in England, volume 7. Acoustics and radar: England's early warning systems 1915-1945
Source details :
Page(s) : 8-19,156
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Source Number : 3
Source : World Wide Web page
Source details : http://www.kenthistoryforum.co.uk/index.php?topic=5932.0
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Source Number : 4
Source : Vertical aerial photograph reference number
Source details : 21-APR-2007 HTTP://WWW.EARTH.GOOGLE.COM [ACCESSED 24-FEB-2011]
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Monument Types:
Monument Period Name : Early 20th Century
Display Date : Built in 1928
Monument End Date :
Monument Start Date : 1928
Monument Type : Sound Mirror, Building
Evidence : Structure, Documentary Evidence, Earthwork

Components and Objects:
Related Records from other datasets:
External Cross Reference Source : DoB Non Anti Invasion Database UID
External Cross Reference Number : 3003
External Cross Reference Notes :
External Cross Reference Source : SMR Number (Kent)
External Cross Reference Number : MKe17880
External Cross Reference Notes :
External Cross Reference Source : National Monuments Record Number
External Cross Reference Number : TR 23 NE 46
External Cross Reference Notes :

Related Warden Records :
Associated Monuments : 462809
Relationship type : General association
Associated Monuments : 464039
Relationship type : General association
Associated Monuments : 1534419
Relationship type : General association

Related Activities :
Associated Activities : LANDSCAPES OF WAR RECORDING PROJECT
Activity type : MEASURED SURVEY
Start Date : 2008-01-01
End Date : 2009-12-31
Associated Activities : SOUTH EAST RAPID COASTAL ZONE ASSESSMENT SURVEY NMP (COMPONENT 2) GLOUCESTERSHIRE COUNTY COUNCIL
Activity type : AERIAL PHOTOGRAPH INTERPRETATION
Start Date : 2011-01-10
End Date : 2011-07-10