Not all carousels are created equal, and not all do the same thing. You want to see some of the better examples, visit Knoebels, Astroland or Hersheypark, while some bad examples can be found at Williams Grove or Camden Park. I have seen machines that have all standers, all jumpers, machines with ring catches and many more without. I have seen machines that run backwards and machines that run clockwise as opposed to the more common counter-clockwise. I have even seem a machine that has all roasters on it (it no longer exsists saddly). This one is above average, it is well cared for and run well, as I have already stated.
In no way should it be compared to the museum in Bristol, that while excellent, does not even have a machine on site. They are two different things.