About: http://webisa.webdatacommons.org/453044151

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 tube 21 may be adjustable in height and the entire apparatus may be adjusted to discharge balls at any desired intervals such as one to five seconds between each ball.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com