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Those old cardboard sleeved slide-charts !!
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Tomorokoshi:
This Measurement Error Calculator from Hewlett Packard oscilloscopes can be used to perform many useful calculations. It includes a basic slide rule. For instance, I can now easily calculate that 10 / 2 = 4.97.
Neomys Sapiens:
First, one specimen which is completely in accordance with the title of the thread: A Rotring (manufacturer of drawing supplies) slider intended as a general aid for maths and geometric calculations:






Then two circular application-specific slide rules.
A BBC (Brown Boverie & Cie.) electrical calculation slide rule, of which one side is dedicated to squirrel cage three-phase motors and their Power, voltage, current, and pole count/speed relationships. The other side is for power factor calculations, i.e. to determine the size of compensation capacitors.





And a Trilux lighting calculator which helps the user to determine the number of lamps which are needed to achieve a certain illumination over an area taking into account their efficiency. (Rear is for room factor, which is a auxiliary quantity which goes into the beforementioned calculation).





The latter two exhibits are not cardboard and I would not call them slide-charts bur rather circular slide rules, but the might be of interest to the readers here.
CatalinaWOW:
I have a couple that might be of interest.  But when I went to where I thought they were stored I found no joy.  I'll keep looking and post when I find them.
TerraHertz:

--- Quote from: Tomorokoshi on June 12, 2020, 12:30:06 am ---This Measurement Error Calculator from Hewlett Packard ...

--- End quote ---

I love ebay!
rsjsouza:

--- Quote from: bsfeechannel on May 21, 2020, 08:15:50 pm ---This is my modest contribution. I have it since donkey's years.

--- End quote ---
I used it a lot when I was a kid. I think I still have this one with me somewhere.
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