About: http://webisa.webdatacommons.org/57185824

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	requirements, in particular on the speed of rotation and leveling, prevented any serious attempt to build a prototype before the second part of the nineteenth century.
http://www.w3.org/ns/prov#wasQuotedFrom	ubc.ca