Home > Science Fact Finder > Mathematics, Numbers, and Computers - Who Invented The Slide Rule?

1. Printable Version
2. Download PDF
3. Cite this Page

Who invented the slide rule?

The slide rule is a device that is used to perform mathematical calculations. The main component of a slide rule is a ruler marked with logarithmic scales. (Logarithmic pertains to exponential relationships between numbers, in which numbers are raised to powers—that is, multiplied by themselves a given number of times.) Answers to math problems are found by sliding a second ruler along the first ruler. The slide rule is useful for multiplication, division, and figuring square roots.

Logarithmic scales were first published by Scottish mathematician John Napier (1550-1617) in 1614. In 1620, Edmund Gunter (1581-1626) a professor at Gresham College in London, England, created the first, primitive version of the slide rule, which he called a "logarithmic line of numbers."

The following year English mathematician and minister William Oughtred (1574-1660) invented the first linear...

Join eNotes

The above is a free excerpt. Get total access to this content with the:

eNotes Pass

1. Mathematics
   1. What is the most enduring mathematical work of all time?
   2. Who discovered the formula for the area of a triangle?
   3. What are the common mathematical formulas for area?
   4. What are the common mathematical formulas for volume?
   5. When did the concept of square roof originate?
   6. What is the probability of a successful triple play occurring in a single baseball game?
   7. What is the Pythagorean theorem?
   8. How is Pascal's triangle used?
   9. What is the difference between a median, a mean, and a mode?
   10. How many feet are on each side of an acre that is square?
   11. What are the Platonic solids?
   12. What are "Napier's bones"?
   13. Who invented the slide rule?
   14. How long has the abacus been used? Is it still used?
   15. How is "casting out nines" used to check the results of addition or multiplication?
   16. What is Zeno's paradox?
2. Numbers
   1. What is the value of pi out to 30 digits past the decimal point?
   2. What is the largest prime number presently known?
   3. What are Roman numerals?
   4. Is it possible to count to infinity?
   5. What is a perfect number?
   6. How large is a googol?
   7. Why is seven considered by some to be a magical number?
   8. What are Fibonacci numbers?
3. Computers
   1. Who invented the computer?
   2. Who was the first programmer?
   3. What is a computer program?
   4. What does DOS stand for?
   5. What is meant by "fifth generation computers"? What are the other four generations?
   6. What is a fuzzy search?
   7. What is a silicon chip?
   8. Are any devices being developed to replace silicon chips?
   9. How is a byte defined?
   10. How is a hard disk different from a floppy disk?
   11. Why does a computer floppy disk have to be "formatted"?
   12. What is the lifespan of a CD-ROM disc?
   13. What is a pixel?
   14. Who invented the computer mouse?
   15. What is a computer "virus" and how is it spread?
   16. Where did the term "bug" originate?
   17. What is e-mail?
   18. What is a hacker?
   19. How do you position yourself correctly in front of a computer screen?
   20. What was the first successful video-arcade game?
   21. Should a personal computer be turned off when not in use?

1. Aristotle