Photo Attribution:
By: Rob Marquardt
I would be able to show my students the history of drawings in this picture is a blue print. It is a what they would think of as "old". Now days we print out our drawings we no longer use the blue print machines, these were primarily used on manual drawings. The red ink is how a checker (a position) not regularly used as much as in earlier day. We used to say if our drawings had a lot of red ink on it the checker bleed all over our job. This meant we made a lot of mistakes. To this day I do not usually check in red ink.
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