5 Matching Annotations
  1. Sep 2024
  2. Jan 2024
  3. Oct 2023
  4. May 2022
    1. What is that tool under the pencil?

      Sorry, just seeing this now. It's assuredly a sliderule, which would have been a common tool for engineers and mathematicians of his era to have had. They became less common with the advent and proliferation of calculators.

  5. Sep 2021