About: http://webisa.webdatacommons.org/390988768

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	WVe attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a vertical section of the entire apparatus with the operating-piston down and the foot-valve closed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com