What is "autotypography"

Autotypography \Au`to*ty*pog"ra*phy\, n. [Auto- + typography.] A process resembling ``nature printing,'' by which drawings executed on gelatin are impressed into a soft metal plate, from which the printing is done as from copperplate.

n. (context archaic English) A process by which drawings executed on gelatin are impressed into a soft metal plate, from which further prints can be made.