I've treated myself to one of these..
and no it's not some weird victorian medical contraption, it's a steam juice extractor. I bought it very cheaply on Ebay from a lady whose dad used to use it for wine making. I've got such a generous harvest of fruit this year, I thought it would be a useful bit of kit.
There's basically a pan at the bottom which you fill with water, then a second pan on top that collects the juice with a funnel in the middle that directs the steam up to the fruit which sits in the top layer in a basket. It's difficult to describe, you kind of have to see it to get how it works.