About: http://webisa.webdatacommons.org/143163097

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 forming the focusing electrode, the aforesaid distance can be varied by varying the thickness of a spacer 13 formed of an insulator such as glass, as shown in enlarged section at FIGS. 5(a) and 5(b).
http://www.w3.org/ns/prov#wasQuotedFrom	google.com