
Соронзон хэрэгсэл & Тоног төхөөрөмж & Хэрэглээ
Introduction The earliest magnetic tool was compass. Greek sailors used magnet to make compass, which can indicate direction. An object was floating in a bowl full of water. The sailor put a needle magnet on the object. One end of the magnet pointed north and the other end pointed south. A compas...