About: http://webisa.webdatacommons.org/178411112

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	This mechanism is a special form of the four-bar linkage (model C-1) used by James Watt to convert the rotary motion of a steam engine balancer arm into approximate straight-line motion of the pump piston in the late 18th century.
http://www.w3.org/ns/prov#wasQuotedFrom	cornell.edu