The Anthony brothers made a number of stereoscopic cameras, as did a boat load of other people over the years. Most of the older cards were taken with large format cameras and were printed and mounted in large production facilities (Keystone, U&U, etc..) There are a number of good books out there that cover the cameras somewhat, but none that I know of have extensive sections on equipment other than viewers. I'm not sure when they started using what we call medium format cameras, but at least here in the States, large format was the most common type used for the early stereographs.
In the 1950's, the focus (no pun intended) was on slides rather than stereographs, so the equipment was very different.
- Randy