ten　feet　by　twelve；　and　fifteen　or　sixteen　high；　arched　with　free…stone；
  and　supported　by　small　circular　columns　of　the　same；　the
  capitals　and　arches　Saxon。　　It　has　an　east　window；　and　on　each
  side　in　the　wall；　about　four　feet　from　the　ground；　a　stone　basin
  with　a　hole　and　iron　pipe　to　convey　the　water　into　or　through
  the　wall。　　This　chapel　is　one　of　the　buttresses；　but　no　sign　of　it
  without；　for　even　the　window；　though　large　within；　is　only　a
  long　narrow　loop…hole；　scarcely　to　be　seen　without。　　On　the　left
  side　of　this　chapel　is　a　small　oratory；　eight　by　six　in　the　thickness
  of　the　wall；　with　a　niche　in　the　wall；　and　enlightened　by　a
  like　loop…hole。　　The　fourth　stair　from　the　ground；　ten　feet　west
  from　the　chapel　door；　leads　to　the　top　of　the　tower　through　the
  thickness　of　the　wall；　which　at　top　is　but　three　yards。　　Each
  story　is　about　fifteen　feet　high；　so　that　the　tower　will　be　seventy…five
  feet　from　the　ground。　　The　inside　forms　a　circle；　whose
  diameter　may　be　about　twelve　　feet。　The　well　at　the　bottom　of
  the　dungeon　is　piled　with　stones。''…Gough's　_Edition　Of　Camden's
  Britannia_。　　Second　Edition；　vol。　iii。　p。　267。