====== Using A Slide Rule ======

| **Field** | Mathematics, Physics |
| **Went Obsolete** | Early_Mid 1970s |
| **Made Obsolete By** | Scientific Calculators |
| **Knowledge Assumed** | Midlevel math and science background required to use it effectively |
| **When useful** | College and professional math, physics, engineering, etc calculations |

The Museum of HP Calculators

Follow link to see instructions on how to use and photo of Slide Rule

http://www.hpmuseum.org/srinst.htm

Some sliderules are still available in antique shops.

NOTABLE EXCEPTION: Pilots continue to use a variant of the slide rule called the circular slide rule http://en.wikipedia.org/wiki/Slide_rule for instant trip calculations involving fuel, time and distance, etc.