This program provides a chronology of the discoveries made about the properties of lodestone, from the initial discovery of lodestone’s mysterious attraction to iron to the conclusion that Earth itself is a huge magnet. (10 minutes)

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Part of the Series : Electromagnetism

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		The Motor Principle This program introduces the motor principle by using the analogy of a futuristic magnetic rail gun. It also shows current flowing through a simple loop of wire within a magnetic field, causing the loop to rotate partially; with the addition of a spli...(more details)		VHS $49.95 DVD $49.95
		The Particle Model This program looks at the early explanations of the source and behavior of light, from the ancient Greeks to Isaac Newton's development of the particle model, and illustrates how this model explained geometric reflection, refraction, and dispersion. ...(more details)		VHS $49.95 DVD $49.95
		Magnetism and Electron Flow This program introduces the left-hand rule for predicting the relationship between the direction of the magnetic field and the direction of flow in a conductor, and demonstrates the extended magnetic field surrounding a helix. (10 minutes)(more details)		VHS $49.95 DVD $49.95
		Life in the Field The effects of Earth's magnetic field on all forms of life are dramatically illustrated. This program looks into the theory that many animals became extinct as a result of occasional reversals of Earth's magnetic field; it also examines the use of th...(more details)		VHS $49.95 DVD $49.95
		Domain Theory This program examines the electromagnet and illustrates the relative conductivity of various metals at the atomic level. The left-hand rule for coils is introduced, and the way that atoms of materials such as iron and steel arrange themselves in doma...(more details)		VHS $49.95 DVD $49.95 DVD + 3-Year Streaming $74.93 3-Year Streaming $49.95

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