Uploaded March 2022 | Updated September 2026, 2 hours ago

---

Otis King's Pocket Calculator is a cylindrical slide rule. It was made from about 1922 till the early 1970s. This is a model K from the early 1960, which has just two logarithmic scales which allow you to multiply or divide.

For more information about this and other calculators in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:31 Description
2:09 Multiplication, Division
5:18 Otis King
6:04 Carbic Limited
7:32 Outro