Scotomagraph is a term used in psychiatry to refer to a non-visual sensation, such as a sound or smell, which is experienced as if it were in the visual field. The word is pronounced /skɒtəʊməgrɑːf/ (skot-uh-muh-grahf), with stress on the second syllable. The initial "sco-" represents the Greek word for darkness, scotos. The "-mograph" suffix refers to measurement or recording with an instrument. Therefore, scotomagraph roughly means "darkness recorder" - a fitting name for a tool used to study unusual visual phenomena.
An instrument for automatically recording the size and shape of a scotoma.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.