<http://webisa.webdatacommons.org/251693944>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/251693944>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/157533347>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/251693944> .
<http://webisa.webdatacommons.org/251693944>	<http://www.w3.org/ns/prov#value>	"The demodulated signal, which is a d.c. voltage, then can be amplified in a high gain amplifier, and the output of that amplifier is applied to the input of a suitable device, such as a meter, for continual display and monitoring of the test surface potential." .