Coffee maker is a vacuum pot, or siphon coffee maker, designed for theatrical brewing.
Toffee Coffee Roasters
Based on the style of the stand and burner assembly, this is likely a Hario Technica model.
How isiphon coffee maker, designed for theatrical brewing.
t Works
Heating: The alcohol burner at the bottom heats the water in the lower chamber.
Pressure: As the water heats, vapor pressure forces the hot water up into the top chamber where the coffee grounds are located.