1) Collotype 2) Collotype printing 3) Copier 4) Copy on a duplicator 5) Duplicator 6) Heliotype 7) Photogelatin process 8) To duplicate by this process 1) Heliotype 
The hectograph or gelatin duplicator or jellygraph is a printing process which involves transfer of an original, prepared with special inks, to a pan of gelatin or a gelatin pad pulled tight on a metal frame. The hectograph was invented in Russia in 1869 by Mikhail Alisov. While the original use of the plate has faded, it has recently been revived...
• (n.) A contrivance for multiple copying, by means of a surface of gelatin softened with glycerin.
direct-process duplicator using either gelatin or the spirit process for making a master copy.[1 related articles]
Hec'to·graph noun [ Greek ... hundred + -graph .] A contrivance for multiple copying, by means of a surface of gelatin softened with glycerin. [ Written also hectograph .]
[n] - duplicator consisting of a gelatin plate from which ink can be taken to make a copy 2. [v] - copy on a hectograph
heliotype noun duplicator consisting of a gelatin plate from which ink can be taken to make a copy