Anddd.... we have a winner!! Wallis first used this symbol in 1655 in "De sectionibus conicis" and again in "Arithmetica infinitorum" in 1656. Bill Ellis wb9cac@attbi.com ----- Original Message ----- From: "Steve Hodges" <shodges@wantree.com.au> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@listserver.isc.rit.edu> Sent: Sunday, September 08, 2002 8:19 AM Subject: Re: Infinity sign on lenses > I'll go with John Wallis. > > Steve > > ADavidhazy wrote: > > > > AndrewF posed: > > "You've all seen the flat eight on your lens - know who 'invented' it?"
