Obtained a Cory DCU/DCL gasket-less vacuum pot coffee brewer to play with. It is a vintage pot, I cannot pin down the exact vintage, I would guess anywhere from the 1950's to 1960's?
It is a really cool device, especially love that this model is gasket-less, the upper and lower globes seal on a ground seam in the glass with some water. The filter is a Cory glass rod, so the only material that touches the water or coffee is glass. I love this simple design.
Here is the patent drawing. I got the drawing and my brew procedure from a great website for all things related to vacuum pots, Vacuum Coffee Pots.
This website is a great resource for the history, science, and methodology of vacuum pot coffee brewing.
I brewed up my first pot in the Cory using 60 grams of light roasted Kenyan, with 900g of water. I ground the coffee to a coarse drip grind level in my OE Lido. It is a nice feature of the Lido that the hopper can hold 30grams, or even more, at one time so you can grind all the beans for a large brewed pot in one go. The brew that it makes is very smooth and clean, a really delicious pot of coffee. I am fascinated by the simplicity of the glass rod filter, it is really an ingenious design. My Cory will be my go to method when I need to make brewed coffee for 3-4 people. All my other brew methods are 1-2 cup designs, the Cory is also good looking enough to leave out as a display item in the kitchen. You can buy these off eBay for $40-$50USD, and they make a superior cup in my opinion to many of the much more expensive drip machines.