The Linotype book The Legibility of Type. (Brooklyn, NY: The Mergenthaler Linotype Company, 1935) contains a technical marketing summary of the process of making matrices. Here are a few relevant illustrations from it.
Here is the brass pattern so engraved. Note that Warde (1935) writes of this pattern being created by soldering two brass plates together, cutting the letterform out of one, riveting it to the other where it should be retained, and discarding the rest by melting away the solder. The text here says simply that the surplus area is routed away.
Here's a closeup of the cutting area of the machine. Note that this machine uses a stationary cutter beneath a moving workpiece, as did Benton's early machines. In his later machines, Benton favored a moving cutter and a stationary workpiece.
The Legibility of Type was published in 1935. A search of the copyrigh records failed to disclose a renewal for it. I believe therefore that it entered the public domain upon the expiration of its original copyright in 1963.
Linotype Leadership was published in 1935. A search of the copyrigh records failed to disclose a renewal for it. I believe therefore that it entered the public domain upon the expiration of its original copyright in 1958.
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