A line formed on the earth’s surface by the intersection therewith of a plane passing through the magnetic axis. It is a line determined by the direction of the compass needle. The meridians constantly change in direction and correspond in a general way to the geographical meridians.

The elongation a bar of iron or steel undergoes when magnetized. By magnetization it becomes a little longer and thinner, there being no perceptible change in volume. The change is accompanied by a slight sound–the magnetic tick. An exceedingly delicate adjustment of apparatus is required for its observation.

adj. Adjective. v. Verb. q.v. “Which see.’ / A mark of division, as A/B, meaning “A divided by B.” ./. The same as above. [Transcriber's note: / will be substituted for this divide symbol.] = A mark of equality, meaning “is equal to.” X A mark of multiplication, meaning “multiplied by.” [Transcriber's note: * will [...]

^ Power–Exponential; A^3 means “A cubed” * Multiply / Divide + Add – Subtract ( ) Precedence–Perform before enclosing expression 2E6 Scientific Notation (2,000,000) A ——————— 4.452 X 10^12 X t is rendered as A / ( 4.452E12 * t )

Franklin’s Kite–1752 Faraday’s Law of Induction–1831 Maxwell’s Equations–1861 Edison’s Phonograph–1877 Edison’s light bulb–1879 Edison’s first DC power station–1882 Michelson-Morley experiment disproving ether–1887 Hertz demonstrates radio waves–1888 Westinghouse first AC power station–1891 This book–1892 Discovery of the electron–1897 Marconi radio signals cross the English Channel–1897 First Vacuum Tube–1904 Special Relativity, photo-electric effect explained with photons–1905 General [...]

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