Below are given some sentences out of which the sentence numbered 4 has been correctly placed. The rest of the sentences A,B,C,D,E,F need to be arranged correctly in order to form a logical order.

1. Dry compasses began appearing around 1300 in Medieval Europe and the Medieval Islamic world.
2. The compass was later used for navigation during the Chinese Song Dynasty (960–1279 AD), as described by Shen Kuo. 
3. Magnetized needles and compasses were first described in medieval Europe by the English theologian Alexander Neckam (1157–1217 AD).

4. Later compasses were made of iron needles, magnetized by striking them with a lodestone.

4. The first compasses were made of lodestone, a naturally magnetized stone of iron, in Han dynasty China (202 BC – 220 AD).
5. This was replaced in the early 20th century by the liquid-filled magnetic compass.
6. The compass was invented more than 2,000 years ago.