The image in Post #6 is a "half tone" as it would appear on a printed page - note the clearly visible dots in the image.
The original photo is re-photographed onto negative film, through a half tone screen, which is a clear film with "X" lines of dots per square inch, for example, 90 LPI, when more lines per inch produce a finer, better quality reproduction. The half tone screen is in direct close contact with the required size film sheet being exposed, being drawn down on the process camera back by vacuum.
Once the neg is processed, it is then exposed, again in direct close contact, onto the printing plate. On the printing press, ink is picked up where there are dots, and no ink where the plate is "clear", thus producing a printed "illusion" of a black and white continuous tone image.
Described above is the "traditional" half tone process, now replaced by digital methods, but the basics remain the same.