I have this stove top juicer and do find it very useful in years when we produce a lot of fruit. You put all fruit into the top basket and some water in the bottom. Then leave it on the stove to come to a gentle boil. As the water boils the steam rises and forces the juice out of the fruit in to the central compartment. The juice can then be tapped off using the hose and clamp at the bottom of the middle section.
You do have to be careful when you are running off the juices as it can be very hot. Once it has cooled a little you can measure how many pints you have collected.
Boil up 1 pint of juice to alb of sugar and you have a fruit syrup which you can bottle and keep in the same way as jam. Made with blackcurrants it's just like Ribena, but at much less cost and very tasty for winter time hot drinks !
Does anyone else make juice ?