So the first slide was a railroad spike and then things like whiskey bottles were used and other various things usually with the guitar on a lap the invention no one really knows where it came from they probably had many steps but they mentioned the finger slide is really interesting because what they ended up doing is taking a guitar string and heating it in a fire and then wrapping a around the mouth of a whiskey bottle And then doing various links for different fingers and then you can use that as a finger slide those are the first finger slides that's kind of cool

I am wishing you had attached a picture or a video because I'm not really sure what a finger slide is Do you mean like a slide whistle? Can you do a follow-up with a picture?