About: http://webisa.webdatacommons.org/300204661

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	An alternative is to rotate the polarizer automatically using a mechanism such as a stepping motor, however, such mechanisms add to the cost and detract from the reliability of such an instrument.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com