“ Johannes Trithemius - Rotating Paper Volvelle used as a Cipher Disc, “Polygraphy”, A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts. It is considered an early example of a paper.
The RADIAC Calculator is used by the US Army to determine the dose rates and doses to personnel after a nuclear explosion. It is the military version of the “Radiation Dosage Calculator” developed by William Orr.
book ‘Reinventing the Wheel’. It contains lots of pictures of old card dials, used for a variety of purposes.