The Collaborative International Dictionary
Melograph \Mel"o*graph\ (m[e^]l"[-o]*gr[.a]f), n. [Gr. me`los a song + -graph : cf. F. m['e]lographe.] Same as Melodiograph.
Wiktionary
n. A device designed for analysing and plotting the frequency characteristics of ethnic music.
Wikipedia
The Melograph, similar to the Melodiograph, is a mechanical apparatus for ethnomusicological transcription usually producing some sort of graph that can be preserved and filed, similar to a recording of music. Beginning with attempts by Milton Metfessel in 1928, assorted devices such as this have been developed or manufactured, the most notable dating back to the 1950s and situated at the University of California in Los Angeles ( Charles Seeger), the University of Oslo ( Olav Gurvin and Karl Dahlback), and the Hebrew University in Jerusalem ( Dalia Cohen and Ruth Katz).
Usage examples of "melograph".
In Germany the Ariston player with thirty-six notes then the Hupfeld with sixty-one still no pneumatics till the Welte family patents its pneumatic Orchestrion operated with a perforated paper roll, in France Carpentier shows his Melograph and Melotrope to the French Academy, mechanical fingers brought to life by electromagnets and a perforated strip.