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Static Immersion

IM 3.07 Recap

  • The first known patent for at French press was filed in 1852 by two French inventors, Mayer and Delforge.
  • In tests, we found that the temperature of a brew prepared in a French press made of vacuum-insulated steel declined at the slowest rate. Next-slowest was acrylic plastic; of all the French presses we tested, Pyrex glass lost its heat the most quickly. 
  • Immersion brews lose their heat more slowly than pour-overs.