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Line 91: == Transition == Towards the end of its life hot metal composition in newspapers was kept alive by the proof press. As each page was set and locked up, it was moved on a turtle (a rolling table with an [[surface plate\|accurately flat]] steel surface<ref>{{cite web \|url=http://www.printerhistory.com/lore.html \|archive-url=https://web.archive.org/web/20031212054328/http://www.printerhistory.com~~:80~~/lore.html \|dead-url=yes \|archive-date=12 December 2003 \|title=A Few Words About Words \|publisher=Pressed for Time \|accessdate=9 May 2014 \|df= }}</ref>) to the manual proof press where it was hand inked and a single very high quality proof was pulled. This proof could then be [[Process camera\|photographed]] and converted to a negative. Black paper was inserted before the proof was photographed for each of the photos on the final page to create clear windows in the negative. The separately made [[halftone]]s would be taped into these clear windows on the negative. This negative could then be used to expose the photosensitized printing plate for an [[offset printing\|offset press]]. In this way the heavy investment in hot metal typesetting could be adapted to the newer offset technology during a transition period.

Hot metal typesetting: Difference between revisions