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St Patricks Tower is a former 
smock windmill
The smock mill is a type of windmill that consists of a sloping, horizontally weatherboarded, thatched, or shingled tower, usually with six or eight sides. It is topped with a roof or cap that rotates to bring the sails into the wind. This ty ...
that was built to power the Thomas Street Distillery. It is on Thomas Street, near the corner with Watling Street and is now part of the Digital Hub
The Digital Hub is a cluster of technology, digital media and internet companies in The Liberties area of Dublin, Ireland. The hub consists of almost 75 companies located in eight buildings, collectively employing 700 people. It is the largest ...
. The mill was originally built in 1757 and rebuilt in 1815.
References
{{Reflist Smock mills Buildings and structures in Dublin (city) Defunct distilleries in Ireland 1757 establishments in Ireland Towers in Dublin (city)