Vintage Otis King calculator, a type of cylindrical slide rule.

---

Size: 4800px × 7282px
Photo credit: © GUSTOIMAGES/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -, 1900s, 20th, analogue, background, calculation, calculator, century, compact, cut, cylindrical, helical, historical, history, industrial, industry, king, life, mathematical, mathematics, measurements, medicine, otis, pocket, shot, studio, vintage, white