I remember working at a very large Mural Printing house and though the vacuum walls were present none of the printers used them, Yes a result of zealous in-house Mechanics wanting more toys than really needed. These walls were huge as some of the rooms were to handle 72 in roll b 100ft paper stock from Kodak , you can imagine the cost of these units .
I used a series of 3 ft magnets with handles, not sure where the hell we got them, the basic idea was to set a corner angle from the top left corner if you were right handed.. you would but the paper into this corner and with a second magnet you would put on the paper in the butt... this would mean that you set the starting position 1-2 inches on the width to hold the paper and you would then use the top magnet to guide you along and placing magnets along the top as you go , you would be tipping the magnet slightly onto the paper to hold which means you would be hard pressed to make a full image bleed. Once you got the paper across the width of the image you would anchor with magnets the complete sheet top bottom and sides.
This sounds quite complicated but actually after a few trys quite easy, In a good day we could go through 5-7 hundred of feet of paper making 4ft x 8 ft prints. We had econo-rolls to give exact paper cuts but I also did work with paper directly from the box on the floor and cut with blade using a point on your body for measurement when you pull the paper up. This method was actually quite accurate after time, but for sure I preferred the auto cutters. We worked in individual rooms connected to the dark hall which had three different processors for whatever size or product you were using .. one machine for the 72 inch paper , one machine for Duratrans , one for smaller paper runs , and one machine for Black and White RC.
Taking the paper from the wall was just reversing your magnet removal and believe me after time it gets real easy. Once off the wall run to the processor in dark put on machine and back to the enlarger for the next print.
Enlarger needs glass carrier and much effort must be made in advance to lock the enlarger on rails in at different magnifications and critical level.. This is actually the really hard part and without this you are screwed IMHO . I never did this job as it is above my pay grade, the floor quality the leveling of the rails that will over time not move and the ability to level the Metal wall is crucial.
I have seen some poor lab technicians working in sub standard labs trying to compete with no leveled rails and in my worst nightmare I would never attempt to do this. The only exception is if 1. you can set the enlarger up and never again move it . This would be a situation where all the negs are exactly the same and one never does a second size.(this sounds quite Impractical) the other is to do a set up where the wall moves to the enlarger ... I have actually scene this setup where a photographer cut a hole through his floor and projected to a drop table in the basement below, this was an incredibly efficient idea for this fellow, and in my 40 years of professional printing the only time I ever saw this vertical setup.
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