I've found this tubular thing (9 - 22 cm in length, about 2 cm in diameter) in a thrift store.
There is a single lens in each end. It has moveable parts like a mirror that rotates 360 degrees around the tube. During part of this travel it faces an oval hole on tube's wall where one can see a tiny prism inside which can intersect the tubular axis by moving a lever from outside. Directing the gadget toward a light source and looking at from the less populated end of the "tube" I see a typical rainbow. (Light travelling from one end to the other crossing the prism inside). Moving the lever properly while light reflecting from the mirror enters inside (and is reflected to cross the prism) makes two adjacent rainbows visible at the far end of the tube. Oh well! I am not sure if I was able to describe it... Anyway, I ask just out of curiosty. Has anyone ever seen something like this? https://www.flickr.com/photos/bc_the_path/sets/72157707409395914 Bulent --------------------------------------------------------------------- http://patoloji.gen.tr http://celasun.wordpress.com/ http://www.flickr.com/photos/bc_the_path/ http://photo.net/photodb/user?user_id=2226822 http://www.pentaxphotogallery.com/artists/bulentcelasun -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
