About: http://webisa.webdatacommons.org/19998361

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	In Figs 2 and 3, 's' is a morse sounder or a register or some suitable apparatus
http://www.w3.org/ns/prov#wasQuotedFrom	virginia.edu