Comment by fjfaase
3 months ago
I have one at home, which is the one we had to buy to use in highschool. In the math classrooms we had a 6 feet version that could be mounted on the blackboard such that the teacher could used for instruction. See for a picture on the Dutch page https://rekenlat.barneveld.com/rekenliniaal.htm
These TMSLs were also reasonably common in classrooms in the United States in the 1950s.
Two Meter Slide Rule
Wow that's fascinating! Crazy how things change, no wonder my grandma thinks math is black magic!