Historical documents on Scientology's e-meter

The E-METER (Volney Mathison created the e-meter, which L. Ron Hubbard then expropriated)

e-meter from the 1940's [pdf]

a pre-Mathison e-meter

Mathison emeter schematic

another schematic

Mathison e-meter instructions

Mathison documents

Mathison teachings (compare to Dianetics)

more theory

History of the e-meter by Mathison

Ad for early Mathison e-meter

Mathison e-meter documents

Mathison material

Scientology e-meter