History of Electricity

Electrical science was established in the Elizabethan Age.

Otto von Guericke's generator
Otto von Guericke's static electricty generator - 1660. LOC

The foundation of modern electrical science was definitely established in the Elizabethan Age.

History of Electricity - William Gilbert

The history of electricity begins with William Gilbert, a physician who served Queen Elizabeth the first of England. Before William Gilbert, all that was known about electricity and magnetism was that the lodestone possessed magnetic properties, and that rubbing amber and jet would attract bits of stuff to start sticking.

In 1600, William Gilbert published his treatise De magnete, Magneticisique Corporibus (On the Magnet).

Printed in scholarly Latin, the book explained years of Gilbert's research and experiments on electricity and magnetism. Gilbert raised the interest in the new science greatly. It was Gilbert who coined the expression "electrica" in his famous book.

History of Electricity - Early Inventors

Inspired and educated by William Gilbert several Europeans inventors, Otto von Guericke of Germany, Charles Francois Du Fay of France, and Stephen Gray of England, expanded the knowledge.

Otto von Guericke proved that a vacuum could exist. Creating a vacuum was essential for all kinds of further research into electronics. In 1660, Otto von Guericke invented a machine that produced static electricity, this was the first electric generator.

In 1729, Stephen Gray discovered the principle of the conduction of electricity.

In 1733, Charles Francois du Fay discovered that electricity comes in two forms which he called resinous (-) and vitreous (+), now called negative and positive.

History of Electricity - Leyden Jar

The leyden jar was the original capacitor, a device that stores and releases an electrical charge. (At that time electricity was considered the mysterious fluid or force.) The leyden jar was invented Holland in 1745 and in Germany almost simultaneously.

Both Dutch physicist Pieter van Musschenbroek and German clergyman and scientist, Ewald Christian Von Kleist invented a leyden jar.

When Von Kleist first touched his leyden jar he received a powerful shock that knocked him to the floor.

The leyden jar was named after Musschenbroek's hometown and university Leyden, by Abbe Nolett, a French scientist, who first coined the term "Leyden jar". The jar was once called the Kleistian jar after Von Kleist, but this name did not stick.

History of Electricity - Ben Franklin

Ben Franklin's important discovery was that electricity and lightning were one and the same. Ben Franklin's lightning rod was the first practical application of electricity.

History of Electricity - Henry Cavendish & Luigi Galvani

Henry Cavendish of England, Coulomb of France, and Luigi Galvani of Italy made scientific contributions towards finding practical uses for electricity.

In 1747, Henry Cavendish started measuring the conductivity (the ability to carry an electrical current) of different materials and published his results.

In 1786, Italian physician Luigi Galvani demonstrated what we now understand to be the electrical basis of nerve impulses. Galvani made frog muscles twitch by jolting them with a spark from an electrostatic machine.

Following the work of Cavendish and Galvani came a group of important scientists and inventors, including: Alessandro Volta of Italy, Hans Oersted of Denmark, Andre Ampere of France, Georg Ohm of Germany, Michael Faraday of England, and Joseph Henry of America.

Continue > The Work of Joseph Henry

Joseph Henry was a researcher in the field of electricity whose work inspired inventors.

Joseph Henry Biography

In 1799, Joseph Henry was born in Albany, New York. He was educated at Albany Academy (now Princeton University). Intending to become a doctor, he studied natural sciences.

In 1824, Joseph Henry was employed as an assistant engineer on a survey team for a State road, three hundred miles long, between the Hudson River and Lake Erie.

The experience changed the course of his career; he decided to study civil and mechanical engineering instead of medicine.

Work with Magnets

Joseph Henry's first discovery was that the power of a magnet could be immensely strengthened by winding it with insulated wire. He was the first person to make a magnet that could lift thirty-five hundred pounds of weight. Joseph Henry showed the difference between "quantity" magnets composed of short lengths of wire connected in parallel and excited by a few large cells; and "intensity" magnets wound with a single long wire and excited by a battery composed of cells in series. This was an original discovery, greatly increasing both the immediate usefulness of the magnet and its possibilities for future experiments.

Michael Faraday, William Sturgeon, and other inventors were quick to recognize the value of Joseph Henry's discoveries. Sturgeon magnanimously said, "Professor Joseph Henry has been enabled to produce a magnetic force which totally eclipses every other in the whole annals of magnetism; and no parallel is to be found since the miraculous suspension of the celebrated Oriental imposter in his iron coffin."

Self Induction

Joseph Henry discovered the phenomena of self induction and mutual induction. In his experiment, a current sent through a wire in the second story of the building induced currents through a similar wire in the cellar two floors below.

Telegraph

A telegraph was an early invention that communicated messages at a distance over a wire using electricity that was later replaced by the telephone. The word telegraphy comes from the Greek words tele which means faraway and grapho which means write.

The first attempts to send signals by electricity (telegraph) had been made many times before Joseph Henry became interested in the problem. William Sturgeon's invention of the electromagnet encouraged researchers in England to experiment with the electromagnet. The experiments failed and only produced current that weakened after a few hundred feet.

Basis For the Electric Telegraph

However, Joseph Henry strung a mile of fine wire, placed an "intensity" battery at one end, and made the armature strike a bell at the other. Joseph Henry discovered the essential mechanics behind the electric telegraph.

This discovery was made in 1831, a full year before Samuel Morse invented the telegraph. There is no controversy as to who invented the first telegraph machine. That was Samuel Morse's achievement, but the discovery which motivated and allowed Morse to invent the telegraph was Joseph Henry's achievement.

In Joseph Henry's own words: "This was the first discovery of the fact that a galvanic current could be transmitted to a great distance with so little a diminution of force as to produce mechanical effects, and of the means by which the transmission could be accomplished.

I saw that the electric telegraph was now practicable. I had not in mind any particular form of telegraph, but referred only to the general fact that it was now demonstrated that a galvanic current could be transmitted to great distances, with sufficient power to produce mechanical effects adequate to the desired object."

Magnetic Engine

Joseph Henry next turned to designing a magnetic engine and succeeded in making a reciprocating-bar motor, on which he installed the first automatic pole changer, or commutator, ever used with an electric battery. He did not succeed in producing direct rotary motion. His bar oscillated like the walking beam of a steamboat.

Joseph Henry - Professor of Natural Philosophy

In 1839, Joseph Henry was appointed as the Professor of Natural Philosophy at Princeton University. There he repeated his old experiments on a larger scale. He confirmed Steinheil's experiment of using the earth as return conductor, showed how a feeble current would be strengthened, and how a small magnet could be used as a circuit maker and breaker, the principles later used for the telegraph relay and the dynamo.

Joseph Henry - Researcher Vs Inventor

Joseph Henry was more of a researcher, rather than an inventor. He stated that "I never myself attempted to reduce the principles to practice, or to apply any of my discoveries to processes in the arts. My whole attention exclusive of my duties to the College, was devoted to original scientific investigations, and I left to others what I considered of subordinate importance, the application of my discoveries to useful purposes in the arts."

Joseph Henry was also uninterested in applying for any patents.

Smithsonian Institution

The Smithsonian Institution was founded in Washington in 1846, and Joseph Henry was its chief executive officer until his death in 1878.

Joseph Henry - Other Achievements

Joseph Henry made meteorology into a science and made the first weather map. He issued forecasts of the weather based upon definite knowledge rather than upon signs. He improved maritime lights and fog signals today.

Even though Joseph Henry was drawn into a controversy with Samuel Morse over credit for the invention of the telegraph, he used his influence to protect Morse's patent.

Joseph Henry advised Alexander Graham Bell, when Bell first had the idea that electric wires might be able carry the human voice. Henry encouraged Bell to proceed with his experiments.

Alexander Graham Bell wrote that Joseph Henry thought Bell's ideas were the beginning of a great invention. Bell told Henry that he faced mechanical difficulties and that he lacked the electrical knowledge necessary to overcome those difficulties. Joseph Henry's advise was "Get It!"

Continue > Electric Cars & Street Lights

Joseph Henry had blazed the way for others to work out the principles of the electric motor and make practical inventions.

Electric Cars

Thomas Davenport, a blacksmith from Brandon, Vermont, built an electric car in 1835, which was road worthy. Twelve years later Moses Farmer exhibited an electric-driven locomotive. In 1851, Charles Grafton Page drove an electric car on the tracks of the Baltimore and Ohio Railroad, from Washington to Bladensburg, at the rate of nineteen miles an hour.

However, the cost of batteries was too great and the use of the electric motor in transportation not yet practical.

Electric Generators

The principle behind the dynamo or electric generator, was discovered by Michael Faraday and Joseph Henry but the process of its development into a practical power generator consumed many years. Without a dynamo for the generation of power, the development of the electric motor was at a standstill, and electricity could not be widely used for transportation, manufacturing, or lighting, like it is used for today.

Street Lights - Charles F Brush

The arc light as a practical illuminating device was invented in 1878 by Charles Brush, a Ohio engineer and graduate of the University of Michigan. Others had attacked the problem of electric lighting, but a lack of suitable carbons stood in the way of their success. Charles Brush made several lamps light in series from one dynamo. The first Brush lights were used for street illumination in Cleveland, Ohio.

Other inventors improved the arc light, but there were drawbacks.

For outdoor lighting and for large halls arc lights worked well, but arc lights could not be used in small rooms. Besides, they were in series, that is, the current passed through every lamp in turn, and an accident to one threw the whole series out of action. The whole problem of indoor lighting was to be solved by one of America's most famous inventors.

Continue > Thomas Edison

The family history of Thomas Alva Edison goes way back. The first American Edisons appear to have come from Holland about 1730 and settled on the Passaic River in New Jersey.

Edison's grandfather, John Edison was a Loyalist during the American Revolution, who fled to Nova Scotia, Canada and later moved to Ontario. Edison's father, Samuel Edison, thought he saw a moral in his father's exile. Samuel wanted to make no such error.

So, when the War of 1837 broke out, thirty-three year old Samuel Edison, sided with the anti-British insurgents. However, this was losing side as well and Samuel Edison was obliged to flee to the United States, just as his father had fled to Canada. He finally settled at Milan, Ohio, and there, in 1847, in a little brick house, Thomas Alva Edison was born.

Early Life of Thomas Edison

When Thomas Edison was seven his family moved to Port Huron, Michigan. The fact that he attended school only three months was not due to poverty. His mother home-schooled Thomas after his schoolmaster reported that he was "addled-brain".

Thomas Edison had a laboratory in his cellar and was an avid experimenter. He needed money for chemicals and that led to his first job and business ventures.

"By a great amount of persistence," Thomas Edison wrote, "I got permission to go on the local train as newsboy. The local train from Port Huron to Detroit, a distance of sixty-three miles, left at 7 A.M. and arrived again at 9.30 P.M. After being on the train for several months I started two stores in Port Huron, one for periodicals, and the other for vegetables, butter, and berries in the season.

They were attended by two boys who shared in the profits."

Thomas Edison bought produce from the farmers' wives along the line which he sold at a profit. He had several newsboys working for him on other trains; he spent hours in the Public Library in Detroit; he fitted up a laboratory in an unused compartment of one of the coaches, and then bought a small printing press which he installed in the car and began to issue a newspaper which he printed on the train.

All before he was fifteen years old.

Thomas Edison's career as a traveling newsboy came to a sudden end. He was at work in his moving laboratory when a lurch of the train jarred a stick of burning phosphorus to the floor and set the car on fire. The irate conductor ejected him at the next station, giving him a violent box on the ear, which permanently injured his hearing, and dumped his chemicals and printing apparatus on the platform.

Thomas Edison and Telegraphy

After losing his job, Thomas Edison soon began to dabble in the mechanics of telegraphy. An interest he wrote began, "from visiting telegraph offices with a chum who had tastes similar to mine."

Edison and his friend strung a line between their houses and learned the rudiments of writing messages by telegraph wire. Then a station master on the railroad, whose child Edison had saved from danger, took Edison under his wing and taught him telegraphy.

At sixteen Edison began a period of five years of being a travelling telegrapher. Toledo, Cincinnati, Indianapolis, Memphis, Louisville, Detroit, were some of the cities in which he worked, studied, experimented, and played practical jokes on his associates. He was eager to learn something of the principles of electricity but found few from whom he could learn.

Edison arrived in Boston in 1868, practically penniless, and applied for a position as night operator. "The manager asked me when I was ready to go to work. 'Now,' I replied." In Boston he found men who knew something of electricity, and, as he worked at night and cut short his sleeping hours, he found time for study. He bought and studied Faraday's works. Presently came the first of his multitudinous inventions, an automatic vote recorder, for which he received a patent in 1868. This necessitated a trip to Washington, which he made on borrowed money, but he was unable to arouse any interest in the device. "After the vote recorder," he says, "I invented a stock ticker, and started a ticker service in Boston; had thirty or forty subscribers and operated from a room over the Gold Exchange." This machine Edison attempted to sell in New York, but he returned to Boston without having succeeded.

He then invented a duplex telegraph by which two messages might be sent simultaneously, but at a test the machine failed because of the stupidity of the assistant.

Penniless and in debt, Thomas Edison arrived again in New York in 1869. But now fortune favored him. The Gold Indicator Company was a concern furnishing to its subscribers by telegraph the Stock Exchange prices of gold. The company's instrument was out of order. By a lucky chance Edison was on the spot to repair it, which he did successfully, and this led to his appointment as superintendent at a salary of three hundred dollars a month. When a change in the ownership of the company threw him out of the position he formed, with Franklin L. Pope, the partnership of Pope, Edison, and Company, the first firm of electrical engineers in the United States.

Continue > Improved Stock Ticker, Lamps, and Dynamos

< Early Life of Thomas Edison

Not long afterwards Thomas Edison released the invention which started him on the road to success. This was the improved stock ticker, and the Gold and Stock Telegraph Company paid him 40,000 dollars for it, more money than he had expected. "I had made up my mind," Edison wrote, "that, taking into consideration the time and killing pace I was working at, I should be entitled to $5000, but could get along with $3000." The money was paid by check and Thomas Edison had never received a check before, he had to be told how to cash it.

Work Done in the Newark Shop

Thomas Edison immediately set up a shop in Newark. He improved the system of automatic telegraphy (telegraph machine) that was in use at that time and introduced it into England. He experimented with submarine cables and worked out a system of quadruplex telegraphy by which one wire was made to do the work of four.

These two inventions were bought by Jay Gould, owner of the Atlantic and Pacific Telegraph Company. Gould paid 30,000 dollers for the quadruplex system, but refused to pay for the automatic telegraph. Gould had bought Western Union, his only competition. "He then," wrote Edison, "repudiated his contract with the automatic telegraph people and they never received a cent for their wires or patents, and I lost three years of very hard labor. But I never had any grudge against him because he was so able in his line, and as long as my part was successful the money with me was a secondary consideration.

When Gould got the Western Union I knew no further progress in telegraphy was possible, and I went into other lines."

Work for Western Union

In fact, however, lack of money forced Edison to resume his work for the Western Union Telegraph Company. He invented a carbon transmitter and sold it to the Western Union for 1000,000 dollars, paid in seventeen annual installments of 6,000 dollars. He made a similar agreement for the same sum for the patent of the electro-motograph.

He did not realize that these installments payments were not good business sense. These agreements are typical of Edison's early years as an inventor. He worked only upon inventions he could sell and sold them to get the money to meet the pay rolls of his different shops. Later the inventor hired keen business men to negioate deals.

Menlo Park - Electric Lamps

Thomas Edison set up laboratories and factories at Menlo Park, New Jersey, in 1876, and it was there that he invented the phonograph, patented in 1878. It was in Menlo Park that he began a series of experiments which produced his incandescent lamp.

Thomas Edison was dedicated to producing an electric lamp for indoor use. His first research was for a durable filament which would burn in a vacuum. A series of experiments with platinum wire and various refractory metals had unsatisfactory results. Many other substances were tried, even human hair. Edison concluded that carbon of some sort was the solution rather than a metal. Joseph Swan, an Englishman actually came to the same conclusion first.

In October, 1879, after fourteen months of hard work and the expenditure of forty thousand dollars, a carbonized cotton thread sealed in one of Edison's globes was tested and lasted forty hours.

"If it will burn forty hours now," said Edison, "I know I can make it burn a hundred." And so he did. A better filament was needed. Edison found it in carbonized strips of bamboo.

Edison Dynamo

Edison developed his own type of dynamo, the largest ever made up to that time. Along with the Edison incandescent lamps, it was one of the wonders of the Paris Electrical Exposition of 1881.

Installation in Europe and America of plants for electrical service soon followed. Edison's first great central station, supplying power for three thousand lamps, was erected at Holborn Viaduct, London, in 1882, and in September of that year the Pearl Street Station in New York City, the first central station in America, was put into operation.

Continue > Serving Alternating Current to the Public