Charles Coolidge Parlin was a scientist and inventor who made important discoveries about how things work. He was born in 1852 and died in 1926. He grew up in Vermont and attended the Massachusetts Institute of Technology, where he studied engineering. He worked for the Bell Telephone Company for several years and helped develop the automatic switchboard, which made it easier for people to use phones. He also discovered the law of manganese, which is the way that electrons move in certain materials. He made many other contributions to science and technology, such as helping to develop a way to measure the electrical resistance of objects. He was an important figure in the history of science and technology, and his discoveries continue to be used today.