In the grand scheme of things, it really wasn’t all that long ago that a slide rule was part of an engineer’s every day equipment. Long before electronic calculators came along, a couple of sticks of ...

It was the only technological tool widely and continuously used for over three centuries. For math and science geeks it was a badge of honor, nestled neatly into a plastic pocket protector along with ...

Click to open image viewer. This circular slide rule computes the relationship among the various parameters of a rocket-propelled space mission: the specific impulse of the rocket motor, the paylod ...