Stigmatypie works from Harpel’s Typograph, 1870. You can zoom in on the details thanks to archive.org.
Stigmatypie produces halftone images with small text characters, like the period (.), similar to dot matrix printing. The technique was developed in 1867 by Carl Fasol, who btw also inspired Valto Malmiola that we recently posted about.
The text segment is from American Encyclopaedia of Printing (1871).
via. h/t: Roel Nieskens