...In the centre of the cloistergarth are the remains of what was the monks' lavatory... 
J. E. Bygate 「Bell's Cathedrals: The Cathedral Church of Durham」
...Turning back towards the infirmary entrance we come to the Lavatory Tower,which stands out from the west end of the substructure of the Prior’sChapel...
Hartley Withers 「The Cathedral Church of Canterbury [2nd ed.].」
...From the lavatory tower a covered passage leads into the great cloister,which can also be approached from a door in the north-west transept...
Hartley Withers 「The Cathedral Church of Canterbury [2nd ed.].」
...Towards the west was the lavatory, the remains indicatingwork of late fourteenth century date...
W.D. Sweeting 「The Cathedral Church of Peterborough」
...A door opened into a lavatory equipped with running water...
Sterner St. Paul Meek 「The Solar Magnet」
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