Making copies with duplicating equipment
Any of the four main duplicating processes (hectograph spirit, stencil, offset litho, and typeset) can be used for making copies. The offset litho process may be necessary when copies must be produced on a paper having a surface for additional written entries after duplicating; the semi-absorbent paper normally used for stencil duplicating is not suitable for use with pen and ink.
Some duplicators will not ‘print’ right up to all the edges of the paper, and a corresponding margin must be allowed. For example, most spirit duplicators require a blank margin about one inch wide along the edge of the paper which is fed into the machine.