Volney Mathison, an early
Dianeticist who, after listening to a lecture by
LRH outlining the
equipment and circuits necessary to detect mental
charge, built the first E-
Meter in 1951, the
Model B. There were various other models of E-Meters built by
Mathison which were used by auditors.
—PDC Volume 3 Approved Glossary, —PDC Volume 7 Approved Glossary