With scientific developments, certain new technologies based on
such scientific principles have now been adopted worldwide. This
has resulted in complete or partial eradication of some old
technologies. Changes in technologies have become more apparent
after the midtwentieth century. The world prosperity has improved
now, and constrains of the Second World War are no longer felt.
Thus the light production using incandescent lightbulb has now
become a thing of the past, while fluorescence-based light
production has resulted in saving large amounts of generated
electric power. Thermal steam-powered (coal-based) locomotive are
now completely replaced by diesel and electricity-powered
locomotives. Technological changes are constantly being reported in
the news. Even before this book was published, in which the
replacement of electronic tubes (valves) by silicon-based
transistors was included as a chapter, now there is report of
carbon nanotubes replacing transistors. In agriculture, there has
been a report of a genetically engineered plant (TomTato) that
shall produce both potatoes and tomatoes. Human memory is
short-lived. The purpose of the present book is to demonstrate such
changes, with selected examples only. I hope more of the younger
generation shall learn that the technologies, which they are now
using, had their old predecessors. Human memory is short-lived. The
new generation may not be aware of a once-useful technology getting
extinct or being replaced due to the development of a better and
stronger new technology. Examples of such changes are numerous, but
here we have only used selected examples to illustrate such
changes.
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