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.