1) Linotype machine contains positive type molds, it assembles them into lines and mechanically left/right justifies them
2) Lino machine pours liquid metal into the line of type to make a negative image (mirror writing)
3) Lino operator runs in k roller over finished article's type and prints a quick copy
4) Copy is sent to readers/copy holders who check the spelling/grammar
5) Lino operator fixes bad lines
6) backwards type articles is sent to subeditors who lay out pages (using fixed type for headlines and including photos)
7) a papermache-like substrate is heat pressed on to the flat page producing a positive image
8) the substrate is bent into a half cylinder and a negative version is cast in to metal
9) the half cylinder is bolted to the main press along with the half cylinder for the facing page
10) the press rolls making positive images and collating all the papers from the different rollers into newpapers
So for the record positive->negative->positive->negative->positive to make a hot metal paper
