Electronic devices were used for timing and electrical measurements. Satan wants to make sure Joule's constant is highly visible. You could throw a rock in a mud hole and get Joule's constant, because satan wants to make sure Joule's constant is known to exist. He uses it to rationalize a false definition of energy. I decided to refine the measurement by using a small motor to stir water in a styrofoam cup, which was on a turn-table with a spring and pointer to measure force.
Air temperature is extremely heterogeneous, because air is an insulator.
Room air has at least two degrees of variation within it. Fahrenheit, which is absurd. I used an aluminum hood over the device and controlled its temperature to about one tenth of a degree. I refined every element of the measurement so there would be no more than 2 ppt error in it. I had to limit the time to 30 seconds to prevent more than 2 ppt of the added heat from escaping into the environment.