Funnel Swirling

  • Richard L. Scheaffer
  • Ann Watkins
  • Mrudulla Gnanadesikan
  • Jeffrey A. Witmer
Part of the Textbooks in mathematical sciences book series (TIMS)


Consider the following simple “game”: A ball bearing will be rolled down a tube and into a funnel; it will swirl around in the funnel for a while and then roll out onto a table. The goal is to maximize the amount of time the ball bearing takes to roll down the tube and out of the funnel. You may adjust the height of the funnel and the angle of the tube as you attempt to maximize time.


Stochastic Process Probability Theory Design Variable Design Factor Factorial Experiment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Bert Gunter (1993), “Through a funnel slowly with ball bearings and insight to teach experimental design,” The American Statistician, 47: 265–269.Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Richard L. Scheaffer
    • 1
  • Ann Watkins
    • 2
  • Mrudulla Gnanadesikan
    • 3
  • Jeffrey A. Witmer
    • 4
  1. 1.University of FloridaUSA
  2. 2.California State UniversityNorthridgeUSA
  3. 3.Fairleigh Dickinson UniversityUSA
  4. 4.Oberlin CollegeUSA

Personalised recommendations