Slide rule workshop

Jean Paul Hild's mystery slide rule No. 2

O I of C slide rule

Click images for magnification




Data:

  • Q = P/5 , R = P/10 , ...
  • The base is made of metal

Questions:

  1. Who made it ?
  2. Where was it made ?
  3. What did it serve for ?
  4. How does it work ?
  5. What is the purpose of the two windows in the bottom ?