When people thought that the world was square, the versorium was placed on a magnetized sphere. It was put on different spots on the magnetized sphere and the point to which it turned was marked. Gilbert explains that after marking a number of points, you can discover the point at which all the points come together. The points, A and B, are the poles. A versorium placed near but not on the magnetized sphere as point D, would point directly at the pole. (http.// Elec. & Mag.)

A versorium is an electroscope and it is an electrostatic measuring device. It was usually a medal needle. The metal would be attracted to charged bodies of

water that were near or close to it. They can do two things. They can indicate the presence of a magnetic charge or electrical field or indicate its quantity. A versorium is basically a compass for electricity. (http.// ask)

Electricity is a form of energy involving the flow of electrons. All matter is made up of atoms. An atom has a center is called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. The nucleus of an atom is surrounded by negatively charged particles called electrons. The negative charge of an electron is equal to the positive charge of a proton, and the number of electrons in an atom is usually equal to the number of protons. When an outside force upsets the balancing force between protons and electrons, an atom may gain or lose an electron. When electrons are "lost" from an atom, the free movement of these electrons constitutes an electric current. Electricity is a basic part of nature. It is most commonly used forms of energy. We get electricity, which is a secondary energy source, from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and

Some topics in this essay:
Compass Electricity, William Gilbert, Benjamin Franklin’s, Elec Mag, BC Chinese, AD China, Qin Dynasty, magnetized sphere, particles called, held near rod, charged particles called, object held near, versorium placed, earth's magnetic field, held near, charged particles, placed near, near rod, object held, qin dynasty, electrons atom,