HP82143A High Res Graphic

[C.Ret]

Hello,

It actually reminds me of the assemblies I made in the laboratory with glue, scissors and cardboard. There were those response curves calculated and printed on an HP plotter from an antique PC. But also, and above all, the monitored reactions where pH, colorimétrie and conductométrie were recorded by various plotters or a stylus on black carboned cylinder surfaces.

For the latter, the photocopier was essential.

For all the curves, gluing on two or three layers of cardboard and meticulous cutting were used to make the integrations by weighing the surfaces under the curves (Pharmacist laboratory balance mandatory and good and sharp cutters).

But, I remember presenting the curves in the right orientation!
Did the digital photocopier forget to make a small rotation of 90° to the left in order to have a properly oriented curve?
   


Today, just follow the link to have these curves on screen!

Or turn on your HP Prime:
   

It's amazing how time has changed the most banal operations!