1 gen 1885 anni - Bi-Metal Thermostat

Descrizione:

"The history of thermostats saw its next development from Warren Johnson, who sought a solution to control furnace heating.

Furnaces were excellent heating systems, as long as they were meticulously tended to. This meant rooms were bitterly cold most mornings if coals weren’t stoked through the night. And rooms could grow stiflingly warm if coals ran too hot. Warren Johnson set out to fix this problem.

As a professor with an early class, Johnson grew tired of teaching in a chilly classroom and leaving for the day drenched in sweat. Nowadays teachers can simply press a button to adjust the temperature, but Johnson had no such luxury. Day after day, he had to find the school janitor and ask him to bump up the heat each morning. Once his classroom warmed up, Warren then had to find the janitor again and ask him to turn the heat back down.

Fed up, Johnson invented a bi-metal thermostat that proactively rang a bell when it was time for the janitor to adjust the furnace damper. Two years later he filed for his 1885 patent for the first multi-zone thermostatic control system. A moment of thermostat history!

This was the beginning of Johnson Electric Service Company, still in operation today as Johnson Controls.

That very same year, Albert Butz filed a patent for his invention of the “damper-flapper, a thermostat that regulated furnace heat by opening and closing the furnace door with an automatic pulley system.” His thermostat was both the first electric thermostat and the first automatic thermostat. Butz’ company eventually sold to Mark Honeywell, who helped bring the first thermostats to homes around the world"

Source: https://getmysa.com/blog/thermostat-talk/the-history-of-thermostats-and-their-evolution-to-smart/

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