I wonder how Phonograph recorders work.
I have never used one, because they are before my time. But they work by storing sound on a round disk. A needle spins around and plays the music off the spiraled grooves. 
Interesting,  the are now antiques I guess or are they still produced?
They are antiques now, but a few bands still produce their music on them. Now they are called vinyl records. 
Yes i know many people collect those and they value the difference in sound that they get.
Yeah, vinyls are kind of a niche now. I know a few audiophiles who swear they can hear an improvement on sound when they used them over CDs and MP3s. 
I bet there is some nostalgia too for those who used them in their youth.
For sure, which it is probably why it is mainly people in their 40s and 50s that use them. Most people now would prefer the convenience of digital media, over the improved sound of vinyl.