Loran

                                                                              





 Loran (long-range navigation) land-based system of radio navigation first developed at Massachusetts Institute of Technology during World War 2 for military ships and aircraft located within 600 miles (about 970 km) of the American coast. In the 1950s a more accurate (within 0.3 mile [0.5 km]), longer-range system (over 2,000 miles [3,200 km]), known as Loran-C, operating in the 90–110 kilohertz range, was developed for civilian use, and the original loran (renamed Loran-A) was phased out.   Eventually, Loran-C was extended to cover most of the continental United States and, in cooperation with Canada and Russia, Canadian waters and the Bering Sea.

Sources

https://www.britannica.com/technology/loran

Compass

                                       

  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.

https://www.ritchienavigation.com/who-we-are/history/