On 2 Nov 2011 at 16:28, Christopher Green wrote: > Lots of talk about classroom technology these days. It might surprise > you to learn that they were having similar debates over 100 years ago. > http://www.apa.org/monitor/2011/11/multimedia.aspx
The article makes brief mention of an episcope, a variant of the magic lantern, which it says was also commonly used in the late 19th century. Actually, our psychology department at McMaster had one for seminar use when I was a graduate student there in the 1970's, only we called it an opaque projector (or epidiascope). It used a very bright (and therefore very hot) light reflected off opaque material, such as the page of a book, to project an image on the screen. I remember in a graduate seminar I once rashly shoved a xeroxed copy of a figure I wanted to display into one of them. Its image began to noticeably smoulder around the edges, and then burst into flames. It was a really hot research topic. Curiously, I've never had that happen with a PowerPoint slide. Stephen -------------------------------------------- Stephen L. Black, Ph.D. Professor of Psychology, Emeritus Bishop's University Sherbrooke, Quebec, Canada e-mail: sblack at ubishops.ca --------------------------------------------- --- You are currently subscribed to tips as: [email protected]. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13090.68da6e6e5325aa33287ff385b70df5d5&n=T&l=tips&o=13853 or send a blank email to leave-13853-13090.68da6e6e5325aa33287ff385b70df...@fsulist.frostburg.edu
