Bulent Celasun wrote: >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
I have no idea what it is but it's fascinating! If you have no luck on the PDML try posting it at https://old.reddit.com/r/whatisthisthing/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
