In our museum you can always find something unique and interesting like this compass, which was a great innovation in the 19th century. It was invented by famous American physicist Edward S. Ritchie. It comes with six needles and a flat card with central buoyancy and it’s filled with liquid. Compass is air tight in metallic case and it could be read at a distance so it would not be affected by any iron on or about the deck of a ship. Special features help in keeping liquid in one place and prevent oxidizing of magnet or card. One that you can see on a picture was made in 1910 for US NAVY and it comes with their exclusive number.