LESSON 14
350
Hypertext and PDF
Testing a cross-reference link
First you’ll see how a cross-reference can be a hypertext link.
1
Double-click Hyper1.fm in the book window to open the first chapter file.
2
Go to page 3.
3
Locate the last paragraph in the subsection on Thomas Alva Edison. The last sentence
in this paragraph has a cross-reference to a section named “The Achievements of Nicola
Tesla.”
4
Do one of the following to activate the hypertext link embedded in the cross-reference:
•
(Windows) Control-Alt-click the cross-reference.
•
(Mac OS) Control-Option-click the cross-reference.
•
(UNIX) Control-right-click the cross-reference.
1
Pioneers in Electricity
he phenomenon that Thales had observed and recorded in antiquity aroused the interest of many sci-
entists through the ages. They made various practical experiments in their efforts to identify the elu-
sive force that Thales had likened to a “soul” and which we now know to have been static electricity.
Of all forms of energy, electricity is the most baf ing and dif cult to describe. An electric current cannot be
seen. In fact it does not exist outside the wires and other conductors that carry it. A live wire carrying a current
looks exactly the same and weighs exactly the same as it does when it is not carrying a current. An electric
current is simply a movement or ow of electrons.
The following sections describe some pioneers in the advancement of our knowledge of electricity.
Section 1: The Early Scientists
Benjamin Franklin
Benjamin Franklin, the
American statesman and scientist born in Boston in
1706, investigated the nature of thunder and light-
ning by ying a child’s kite during a thunderstorm. He
had attached a metal spike to the kite, and at the
other end of the string to which the kite was tied he
secured a key. As the rain soaked into the string,
electricity owed freely down the string and Franklin
Edison’s one-time employee Nicola Tesla went on to
rival his employer and in many respects to outshine
him. For more information on this remarkable—albeit
obscure—inventor, see “The Achievements of Nicola
Tesla” on page 4.
L14.fm Page 350 Sunday, July 7, 2002 10:18 PM
To Next Page
Loading...