Maker Info
E. S. Ritchie & Sons
Edward Samuel Ritchie (1814-1895) established a business in 1850. Shortly after the start of the Civil War, he was making magnetic compasses for the US Navy. He developed the first successful liquid filled compass.
The company was known as E. S. Ritchie & Son (without an "s") in 1866 before becoming E. S. Ritchie & Sons the following year.