<http://webisa.webdatacommons.org/307482819>	<http://www.w3.org/ns/prov#value>	"The 'ball' is an Integrating Sphere, used to measure the various characteristics of light sources, especially 'power output' - luminous intensity, etc." .
<http://webisa.webdatacommons.org/307482819>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/471867629>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/307482819> .
<http://webisa.webdatacommons.org/307482819>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<shorpy.com> .