Natalie:
It just so happens that the full title of Karl Bacon's patent on the Corkscrew coaster is, "Amusement ride with a vehicle track portion following the shape of a helix". That's US Patent #3,889,605 and you can look at it by visiting
http://patent.womplex.ibm.com/details?pn=US03889605__ . Or there is a link to it from my somewhat anemic patents page at
http://capital2.capital.edu/admin-staff/dalthoff/patents.html (now aren't you glad the updated
CP Place handles links?!)
--Dave Althoff, Jr.
*** This post was edited by RideMan on 9/22/2000. ***