About: http://webisa.webdatacommons.org/256286652

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	Basically, the hand or other portion interrupts a steady electric and/or magnetic field, and the detector measures the amount of interruption.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr