brown and white measuring ruler
brown and white measuring ruler
Published on Free to use under the Unsplash License

In the seventies of the previous century I learned to use the sliding rule to make my calculations. I kept the rule and now and then I show it to people. You then can expect two kinds of reactions: 1. What’s that (people who never used it before) 2. Oh, how nice a sliding rule (people who used it)

TrackingTrackingTrackingTracking