Electrotypes made by the genuine Dr. Albert Lead Mold Process are
always duplicates of fine-screen half-tones or mezzo-tints used for
the highest class of commercial job-work, such as three and four color
process or duo-tone printing on paper with a highly glazed surface.
The largest press used in lead molding will give a maximum pressure of
two thousand tons per square inch on a thirty inch ram hydraulically
operated. The weight of this press is over thirty thousand pounds.
[Illustration]
In the lead mold process the plastic medium used is a soft thin sheet
of what is called "impression lead," .040 inches thick, instead of
wax, and the lead is placed on top of the original to be duplicated,
instead of vice-versa, as in the wax-molding process. No "building-up"
nor "black-leading" is necessary.
In all other respects the consecutive steps towards the completion of
the lead mold plate are identical to those used in the Wax Mold
Process.