Source : Webster's Revised Unabridged Dictionary (1913)

Diplograph \Dip"lo*graph\, n. [Gr. ? double + -graph.]
   An instrument used for double writing, as one for producing
   embossed writing for the blind and ordinary writing at the
   same time. -- {Dip`lo*graph"ic*al}, a. -- {Dip*log"ra*phy},
   n.