electrograph

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An electrically produced graph or tracing.
• noun Equipment used to produce such a graph or tracing in facsimile transmission.

from The Century Dictionary.

• noun A curve automatically traced and forming a continuous record of the indications of an electrometer.
• noun An apparatus for engraving the copper cylinders used in printing fabrics and wall-papers.
• noun In photography, a photograph of an electric spark. See the extract.
• noun An instrument for the continuous recording of atmospheric electricity.

from the GNU version of the Collaborative International Dictionary of English.

• noun A mark, record, or tracing, made by the action of electricity.
• noun An apparatus, controlled by electric devices, used to trace designs for etching.
• noun archaic An instrument for the reproduction at a distance of pictures, maps, etc., by means of electricity.
• noun archaic An image made by the Röntgen rays; a sciagraph.
• noun archaic A cinematograph using the arc light.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A mark, record, or tracing made by the action of electricity.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an apparatus for the electrical transmission of pictures
• noun electrical device used for etching by electrolytic means