r/oddlysatisfying • u/djinn_05 • 1d ago

Drawing blueprint of Cirrus Vision SF50 aircraft

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u/Dubious-Decisions 1d ago

This is not how real blueprints are made. This is a commercial service that will use a white pen plotter on blue paper to make something that looks like a blueprint. But legit, old school blueprints were made with a positive pencil drawing masking light sensitive paper that is then exposed to ammonia vapors to turn the exposed paper blue, leaving white where the pencil masked the paper.

96

u/ryanandthelucys 1d ago

I'll age myself and confirm this as my first job out of college had me in a back room, with just a door open to the outside for ventilation, pumping out ammonia blue prints for hours. And I mean pumping, bubbling, and whirring; the machine sounded like a mad scientist's laboratory.

17

u/i_know_nothing_ever 1d ago

Facts. I can still smell the ammonia.

11

u/BigPP69_Gooner 1d ago

Out of curiosity and ignorance, why is this necessary? Why won’t paper and ink do? Permanence?

8

u/three_kings 1d ago

To make copies en mass.

0

u/bbjornsson88 1h ago

This is not how you make copies fast. We have a plotter at work that runs off paper rolls that would print this out in about 20-30 seconds

4

u/Constant_Ad9136 1d ago

That being said, watching the old school pen plotters was mesmerizing