About: http://webisa.webdatacommons.org/362341980

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The device is a mechanical device that senses when the water level falls below a predetermined level, and opens or closes a valve to add water to the boiler.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk