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 be substituted for [...]

^ Power–Exponential; A^3 means “A cubed”
* Multiply
/ Divide
+ Add
- Subtract
( ) Precedence–Perform before enclosing expression
2E6 Scientific Notation (2,000,000)
[...]

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 Relativity: space-time dilation and curvature–1915
Confirmation of general relativity’s prediction of the deflection
of starlight by [...]

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