Slide rule workshop AE

João's fourth mystery slide rule

Portugese Calculating device

Click images for magnification

Portugese calculating device - front Portugese calculating device - back
Portugese calculating device - detail

Data:

  • Calculating device with lots of formula's
  • Made in Portugal on September 7, 1948.
  • The circles on the body and on the movable disk are not conventional slide rule scales, but rather are marked in degrees and other units derived from angles.
  • The device may have been designed for use in educational institutions, and thus produced on a very small scale.
  • Beats the Logarex Typ01 in the number of formulas!

Questions:

  1. What are the scales for?
  2. How do I use them?