In , a professor named Warren Johnson grew tired of the fluctuating temperatures in his classroom at the Whitewater Normal School in Wisconsin. He found himself constantly interrupted by the need to signal the basement janitor to adjust the furnace dampers.
The professor eventually developed a bimetallic strip that bent with the heat. This simple strip completed an electric circuit to ring a bell. That bell told the janitor to shovel more coal or close the flues. It was the first tele-thermoscope, the ancestor of the plastic dial that currently dictates the domestic peace of every home in North America.
The Johnson Invention
Johnson’s invention was born of a desire for focus. He wanted to teach without thinking about the cold. He likely never imagined that his invention would eventually become the primary weapon in a quiet, seasonal war fought in hallways across the suburbs.
The Hallway Sentry
Frisco, Texas. 3:40 PM. The porch thermometer showed 104 degrees. Rick Alvarado walked through the dim hallway of his home. His skin felt the sudden transition from the humid kitchen to the refrigerated air of the interior corridor.
He stopped at the thermostat. The small screen glowed with a pale light. It displayed a crisp 74. Rick pressed the arrow until the number climbed to 77. He sighed. “Nobody in this house is