About: http://webisa.webdatacommons.org/333771838

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	Denoted at 25 is a mirror, denoted at 26 is a lens system, denoted at 27 is a mirror, and denoted at 28 is a lens system all of which serve to illuminate the reticle 30, placed on a reticle stage 137, with the light from the Hg lamp.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com