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.
ALUMINOTYPES
The age long progress in the development and perfection of typographical printing surfaces, from the period of Xylographic blocks on through the successive inventions of individual movable cast-metal type, stereotyping and electrotyping, by both the wax and lead-molding processes, reaches its culmination in Aluminotypes.