Roscobbc
Moderator
I'm reminded of my obligatory 6 months working in the companies drawing office in the mid/late 60's. As a (then) leading manufacterer of potentiometers for the aerospace, nautical and electronics industries we would produce component, mould and press tool drawings for internal applications. As a mere 'oik' in the day I would take the ink lined drawings (on tracing paper) to the huge 'light box' with it's ultra violet lamps, sandwich the drawing (any size up to A1) under a sheet of photosensitive paper to the window off the light source for a timed period, roll it through the developer tank, then peg it up on a towel rail to dry.......long before the days of inkjet and lazer printers.
