If everyone had been given one of these sliding knowledge things then, perhaps, the U.S. would have caught on to the metric system. Let's take a trip to Metricsville, which sounds like a perfectly ghastly and annoying place. You can figure length, weight, volume, temperature, and mileage with this device. Not bad, I must say.
This sliding rule is 8.5 by 14.5 centimeters. It must be from the 70s. Just look at that nauseating color scheme.
The one thing I like about this rule is the name of the company that distributed it: Systems of San Antonio. What the hell is that supposed to be? To paraphrase H.I. McDonough from Raising Arizona: that is one bonehead name