During the Enlightenment, people began to question why and how certain phenomenon occurred. Because there was no clear explanation, people automatically believed it to be the fate of god. Benjamin Franklin, being an enlightened thinker, began to experiment with electricity to try to better understand how exactly it worked.
In class, we tried to model one of these experiments. We blew up balloons and rubbed them with a wool cloth to generate electricity as seen in the image below. We then attached tinfoil to a meal wire and dangled it from a piece of cardboard. We tested to see if there was electricity generated by observing if the tinfoil would be attracted to the balloon or not. As we rubbed the balloon a strong negative charge built up and thus attracted the tin foil which was positively charged.
Similarly, as we can see in his letters to Peter Collinson, Franklin would run experiments and write a clear description as to what he did and what materials he used and then try to draw conclusions to explain the phenomenon he witnessed. He ran experiments several times to try to prove his theories.