About: http://webisa.webdatacommons.org/201611885

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	A separate mirror reflects the sun, or other body, onto the half mirror facing the telescope, while the horizon straight ahead is visible through the clear half.
http://www.w3.org/ns/prov#wasQuotedFrom	handcraftedmodelships.com