When I learned that Nikola Tesla invented the radio, and not Marconi,
I was shocked. Tesla also invented the electric generator, the electric
motor, fluorescent lighting, alternating current (AC) and devised the
technologies that generate and deliver our electrical power for our
homes, schools and factories. So why didn't I ever learn about Tesla in
school -- the same way I learned about Thomas Edison, Marconi and
Einstein?
The story about Nikola Tesla is the story of a genius who was largely
disrespected and abused by other scientists and inventors -- many of
whom stole his ideas and took credit for his discoveries. But how did
this happen?
Born
to a Serbian family on July 9th, 1856 in Smiljan, Croatia (former
Yugoslavia), Nikola Tesla was a dreamer with a poetic touch. His first
"invention" consisted of a rotary engine, powered by insects that the
young Tesla had glued to a paper wheel. This boyhood fascination with
motors developed a unique mental ability where Tesla could visualize
inventions in his mind, complete to the most minute detail, and execute
these plans without the need for a blueprint or meticulous calculations.
As an adult, Tesla attended the Technical University at Graz,
Austria, and the University of Prague. At Graz he first saw the Gramme
dynamo, which operated as a generator and, when reversed, became an
electric motor, and from this observation he conceived a way to use
alternating current to advantage. Tesla had a vision of electromagnetic
fields that was real and tangible, at a time when most engineers
considered electrical current as an intangible and ethereal mystery.
Later, at Budapest, he visualized the principle of the rotating magnetic
field and developed plans for an induction motor that would become his
first step toward the successful utilization of alternating current.
An eccentric genius, Tesla had few friends and remained reclusive. He
never had a home in America, choosing instead to live in hotels. During
the final few decades of his life he withdrew in a New York hotel, only
granting interviews and making annual public appearances on his
birthdays. At these press conferences Tesla proposed future inventions,
but his accounts were frequently distorted by the popular press. After
Tesla's death the Federal Bureau of Investigation took note of Tesla's
proposals for advanced weapons systems and searched his papers for
information about reports of his
death ray machine
as world conflict was impending. (see also
Weapon of Total
Destruction, Viewzone back issue.)
Tesla's
discovery of the rotating magnetic field produced by the interactions of
two and three phase alternating currents in a motor winding was one of
his most significant achievements of the century, and formed the basis
of his induction motor and polyphase system for the generation and
distribution of electricity.
In
1882, before his arrival in America, Tesla went to work in Paris for the
Continental Edison Company, and, while on assignment to Strassburg in
1883, he constructed, in after-work hours, his first induction motor.
Tesla sailed for America in 1884, arriving in New York, with four cents
in his pocket, a few of his own poems, and calculations for a flying
machine. He first found employment with Thomas Edison, who had been his
first employer in Paris, but the two inventors were far apart in
background and methods, and their separation was inevitable.
Tesla continued to work on his inventions, and seizing a momentous
opportunity, George Westinghouse purchased some of Tesla's patents in
1888. For a mere $60,000($5,000 in cash and 150 shares of stock),
Westinghouse acquired the patent for Tesla's polyphase alternating
current technology. Tesla's reputation spread when Westinghouse won the
contract to supply the Chicago World's Fair of 1893 with electricity. In
1895, the Westinghouse Electric & Manufacturing Company and General
Electric Company joined forces to harness the power of Niagara Falls
with electricity, using Tesla's technology.
Tesla's generation of electricity resulted in what is known as
alternating current, or AC. In alternating current the polarity and
strength of the energy is continuously changing or alternating. Prior to
Tesla's innovation, the Edison company was promoting direct current, or
DC, as a safer way to power both homes and factories. In fact, Edison,
despite knowing that Tesla's AC was superior, mounted an ugly publicity
stunts designed to discredit Tesla and to save Edison's own financial
investment in DC.
Animals were brutally electrocuted with AC, including an elephant,
which were recorded by Edison and shown at public gatherings.
Edison
embarked on a number of propaganda campaigns which attempted to persuade
the general public that AC was dangerous. Nicknamed the "death current"
by Edison, public demonstrations were staged in which animals were
brutally electrocuted with AC, including an elephant, which were
recorded by Edison and shown at public gatherings.
Despite the public's fear of AC, Tesla had the upper hand. Direct
current was good only for short distances. The accumulated resistance in
metallic wires and cables greatly reduced the electrical power as it
traveled through the transmission lines. AC, on the other hand, did not
suffer the same loss and was able to travel great distances with little
loss of potential.
Also, because alternating current could react with coils of wire
(transformers) to increase or decrease the voltage, electricity could be
produced at high power levels at the generation stations and then
reduced just prior to being distributed locally. Eventually, Edison lost
his battle and alternating current became the electric industry
standard. To this day, the three-phase form of Tesla's polyphase system
is still used for the generation and transmission of most electricity.
Moreover, the conversion of electricity into mechanical power is made
possible by updated versions of Tesla's three-phase and split phase
motors.
Tesla's
experiments with high frequency and high potential alternating currents
resulted in the development of the "Tesla coil." This device is a
transformer with an air core that has both its primary and secondary
tuned in resonance. As part of other experiments Tesla also developed
the precursors of modern neon and florescent lights. He constructed
these lights, elongated glass tubes filled with gas and coated with
phosphor, excited in his high voltage experiments. He also discovered
that high voltage current could be made harmless by using an alternating
current scheme at very large frequencies.
Returning to New York in 1900, Tesla began construction on Long
Island of a wireless world broadcasting tower, with $150,000 capital
from the American financier J. Pierpont Morgan. Tesla claimed he secured
the loan by assigning 51 percent of his patent rights of telephony and
telegraphy to Morgan. He expected to provide worldwide communication and
to furnish facilities for sending pictures, messages, weather warnings,
and stock reports. The project was abandoned because of a financial
panic, labor troubles, and Morgan's withdrawal of support. It was
Tesla's greatest defeat.
The Supreme Court granted full rights to
Tesla for the invention of radio, nullifying the claims of Marchese
Gugliemo Marconi
In 1943, the Supreme Court granted full rights to
Tesla for the invention of radio, nullifying the claims of Marchese
Gugliemo Marconi who had patented a two-tuned-circuit design and
a more practical four-tuned-circuit modeled after Tesla's. Marconi's
patent on the invention of radio was overturned by the U.S. Supreme
Court because Tesla's work predated it (Case #369, 6/21/43). Marconi did
succeed in beating Tesla as the first person to send a wireless
telegraph across the Atlantic, which prompted Tesla to remark, "Let him
continue. He is using seventeen of my patents." In addition, Tesla's
1903 patents 723,188 and 725,605 contain the basic principles of the
logical AND circuit element basic to all computers.
Tesla
also envisioned a way
to send electricity through the air and through the Earth so that
electrical power would be available everywhere, even in remote corners
of the planet. This technology, which was only understood by Tesla
himself, was incorporated in another famous experiment in 1908, where
Tesla attempted to remotely light up the sky over the North Pole as a
way of demonstrating this wireless power transmission technology to the
world. At the time, Admiral Peary was leading an expedition to the
Arctic and Tesla hoped that Peary would report on the phenomenon when he
returned.
Many believe that Tesla's experiment that evening caused the world's
largest man made explosion in the remote Siberian village of Tungusta.
Read more about that
HERE.
If Tesla's power beam really did accidentally cause the Tungusta
explosion, then we witnessed the first experimental use of the same
weapon system has been developed by the US Department of Defense in
Alaska's remote Poker Flats area, just North of Fairbanks. (See
HAARP: A weapon of Total
Destruction.) Although the capacity for destruction in Tesla's
primitive prototype (some estimate equal to a large hydrogen bomb) was
huge, this new military system is almost surely many magnitudes greater.
Also, many similar systems have been deployed in a dozen specific
locations around the globe -- presumably to be operated together for
some undisclosed purpose. One can only hope that this new technology
will be used for a peaceful purpose and that it will bring the respect
for Tesla that has so far eluded him.
|
Alternating Current vs.
Direct Current
All the principles of generating electricity had been worked
out in the 19th Century, but by its end these had only just
begun to produce electricity on a large scale. The 20th Century
has witnessed a colossal expansion of electrical power
generation and distribution. The general pattern has been toward
ever-larger units of production, using steam from coal- or
oil-fired boilers. Economies of scale and the greater physical
efficiency achieved as higher steam temperatures and pressures
were attained both reinforced this tendency. U.S. experience
indicates the trend: in the first decade of the century a
generating unit with a capacity of 25,000 kilowatts with
pressures up to 200-300 pounds per square inch at 400º-500º F
(about 200º-265º C) was considered large, but by 1930 the
largest unit was 208,000 kilowatts, with pressures of 1,200
pounds per square inch at a temperature of 725º F, while the
amount of fuel necessary to produce a kilowatt-hour of
electricity and the price to the consumer had fallen
dramatically.
As the market for electricity increased, so did the distance
over which it was transmitted, and the efficiency of
transmission required higher and higher voltages. The small
direct-current generators of early urban power systems were
abandoned in favor of alternating-current systems, which could
be adapted more readily to high voltages. Transmission over a
line of 155 miles (250 kilometers) was established in California
in 1908 at 110,000 volts; Hoover Dam in the 1930s used a line of
300 miles (480 kilometers) at 287,000 volts. The latter case may
serve as a reminder that hydroelectric power, using a fall of
water to drive water turbines, has been developed to generate
electricity where the climate and topography make it possible to
combine production with convenient transmission to a market.
Remarkable levels of efficiency have been achieved in modern
plants.
One important consequence of the ever-expanding consumption
of electricity in the industrialized countries has been the
linking of local systems to provide vast power grids, or pools,
within which power can be shifted easily to meet changing local
needs for current.
AC has other advantages:
- AC generators are simple, cheaper and more reliable than
DC generators
- AC can readily be switched by circuit breakers at any
voltage, whereas DC can only be switched at low voltages
- AC motors and other electrical appliances are cheaper,
simpler, and more reliable than those designed to work with
DC
- The frequency can be very precisely controlled and so AC
is useful in motors that require accurate speed eg. Clocks,
tape recorders, VHS machines.
So, while Thomas Edison receives the greater part of credit, it
is clear that we owe respect and gratitude for Nikola Tesla's
creative and intelligent mind. |