[QUOTE=BarnOwl]
What about those pyrex coffeemakers of not so long ago? Those mostly glass things, where the hot water in the lower compartment would bubble up to the upper compartment where the coffee grounds were, and then it’d all seep back down into the glass coffee pot from which it was poured in your cup. Was that a percolator. Sure as hell wasn’t drip.
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Vacuum brewers are pretty much what happens when a French Press pot mates with a drip brewer. The water is heated in the lower globe and rises up to the top globe where the coffee is. Once the water’s all out of the bottom, the heat’s cut off, and the resulting vacuum pulls the coffee-laced water back down to the bottom globe.
About the only difference between vacuum and drip is that in a drip brewer, water falls through the coffee by gravity, and in a vacuum brewer, it’s pulled through the coffee by vacuum suction.