I need help with an OLD Universal sewing machine please...?

I have this old sewing machine. The kind in the cabinet that pops up. It is a Universal brand machine from Standard Sewing Equipment Corp. The model is KAB-M Serial number 300755. So what I really need to know is how to work it. I can not find any manual that is free online, so I figured I would try this. I have only worked with newer machines (very little have I worked with them though) and I have no idea how to get the bobbin to work. It is the metal kind, with the metal fittings and all. I have only worked with the kind that sits straight on the flat side and with the plastic cover. This one basically goes in the opposite. I can not explain it, and not sure if you could either for me to understand, but if you have a good website link or pictures/videos of an OLD machine, not newer, I would really appreciate it. I have searched and searched, but cant find anything.