Electrotyping by the Lead Mold Process
E
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.
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.