Slide Rule

How many remember the slide rule?   There were no hand-held calculators when I was in college (1968-70).   We had to know how to use the slide rule for field work, such as mapping and surveying, so we had a night class for one hour a week for a semester in using a slide rule.  This was after most of us had dinner and a few beers and our attention span was limited.

Did end up getting a C grade in the class and actually remember some of the functions for multiplication, division, square root, etc.   Our teacher knew our limitations at this time of night and allowed us to compare notes, especially during a quiz.   He recognized it was the only way some us were going to make it through the class.

The slide rule is better known as a mechanical analog computer.