Go Fly a Kite!
June 15, 1752: Benjamin Franklin’s kite flying experiment proves lightning and electricity are related. Maybe. The account of Franklin’s experiment wasn’t written down for another 15 years when the tale was placed into Joseph Priestley’s History and Present Status of Electricity. While the idea of old Ben standing out in a storm with a kite floating in the ominous sky, key attached, and the scientist in grave danger is pretty standard, if he did perform the experiment at all, he did not put himself in the path of danger.
Franklin did write much about his fascination with electricity and his premise stating lightning was made of the same energy. At the time, the largest electrical sparks to be generated were about an inch long. To take the giant leap from small spark to the outrageously powerful lightning strike being the same would take some proof. Franklin’s ideas about the phenomenon led him to experiment, but with an intermediary collection device. A Leyden Jar, or capacitor, was used to collect the energy discharged during a lightning strike. Although he did not put himself in the direct line of fire, other experimenters did and died as a result.
Lightning is, in fact, an electrical discharge. It usually occurs during thunderstorms, but can also follow volcanic eruptions and dust storms. Lightning is powerful, moving at speeds up to 130,000 mph and reaching temperatures nearing 54,000° F. This is hot enough to melt silica, turning sand into glass. What we know is when there is enough energy buildup, there is an electrical discharge with a bolt of lightning running either between clouds or from clouds to ground.
Thunder is the audible result of the lightning bolt. During a lightning strike, successive parts of the air are used as a discharge channel. The area superheats along the discharge channel and then the air rapidly expands. This causes a shock wave which we hear as thunder. The rumbling variety is caused by the time delay between the sound of different portions of a long strike. There are ≈ 16 million thunderstorms each year around the globe. With this many storms there are about 1.4 billion lightning flashes per year with 80% of them cloud to cloud and the rest ground strikes. That means 280 million times a year, lightning strikes. It is not evenly distributed around the globe, with 70% of all lightning occurring in the topics.
Electricity is really just organized lightning. – George Carlin
I’d rather be a lightning rod than a seismograph. – Ken Kesey
Television news is like a lightning flash. It makes a loud noise, lights up everything around it, leaves everything else in darkness and then is suddenly gone. – Hodding Carter
The reason lightning doesn’t strike twice in the same place is that the same place isn’t there the second time. – Willie Tyler
Also on this day:
King “Soft-sword” John “Signs” on the Dotted Line – In 1215, King John of England signs the Magna Carta.
Not Spock – In 1844, vulcanization was patented.
Protect Your Eyes – In 763 BC, the first total solar eclipse was recorded.
Electrifying
January 19, 1883: Thomas Alva Edison begins service at Roselle, New Jersey. He had the first electric lighting system employing overhead wires. We take our modern lifestyle with myriad electrical gadgets for granted. But not so long ago, there was no home powered with this energy source.
In about 600 BC, Thales of Miletus described static electricity. The “Baghdad Battery” dating from 250 BC resembled a galvanic cell and may have been used for electroplating. In 1660 Otto von Guericke invented an early electrostatic generator. In 1729, Stephen Gray classified materials as conductors or insulators.
Benjamin Franklin experimented with electricity in the 1740s, sparking follow up studies by Michael Faraday, Luigi Galvani, Alessandro Volta, Andre-Marie Ampere, and Georg Simon Ohm – most of which have names that we use today in electrical studies.
Then next century saw electrical studies continue by Nikola Tesla [induction motor], Samuel Morse [telegraph], Antonio Meucci [telephone], Thomas Edison [1st commercial electric energy distribution network], George Westinghouse [electric locomotive], Charles Steinmetz [theoretician of AC], and Alexander Graham Bell [telephone].
Our mechanized and technological society relies heavily on the transmission of an electrical charge from a power station to our homes and businesses. The culmination of centuries of wonder, is our electric-based society made possible by the painstaking research by these and many other great men. Electrical power to houses has been in use for barely one-and-a-quarter centuries and we are so dependant on it today that when the power goes out, it is an emergency.
“Time and tide wait for no man. A pompous and self-satisfied proverb, and was true for a billion years; but in our day of electric wires and water-ballast we turn it around: Man waits not for time nor tide.” – Mark Twain
“When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I’m sure it made the work seem that much more urgent.” – George Carlin
“To invent, you need a good imagination and a pile of junk.” – Thomas Alva Edison
“Why, sir, there is every possibility that you will soon be able to tax it!” – Michael Faraday (to PM William Gladstone, on the usefulness of electricity)
Also on this day, in 1983 the Apple LISA computer was announced.
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