About: http://webisa.webdatacommons.org/393884975

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	Friction and other losses are made up with a motor on each disc to keep it running at the optimum speed for that position in the tunnel.
http://www.w3.org/ns/prov#wasQuotedFrom	judithcurry.com