Concept 1: Tesla's Teleforce

Prototype 1: Tesla's Teleforce

“He has perfected a method and apparatus, Dr Tesla said yesterday in an interview at the Hotel New Yorker, which will send concentrated beams of particles through the free air, of such tremendous energy that they will bring down a fleet of 10,000 enemy airplanes, at a distance of 250 miles from a defending nation's border and will cause armies of millions to drop dead in their tracks.” - New York Times, July 11, 1934.

Nationality: American
Year of concept: Mentioned in 1934 to American media.
Produced: No.

Weapon: Charged particle beams, firing at approx. 48 times speed of sound (16,333.92 metres per second).
Range: 321 to 402 km (200 to 250 miles)
Engine: Fixed position, unable to move.
Power: Requires own dedicated power plant, estimated to be large.

Background: Dr Tesla, or, Nikola Tesla, was born in 1856, in modern day Croatia, he emigrated to America a fair few years later, and had some dealings, and competition with a little known man called Thomas Edison and invented a wide variety of things, 700 or so, like alternating current, which is what most countries of the world use today.

Now, there currently wasn't any world wars going on at the moment, not even the Spanish Civil War, which was 2 years away, but one suspects that some countries were rearming, which is why this little beauty was proposed, on his 78th birthday, to the American media.

Now to actually explain a bit more about the Teleforce, which is most definitely not a death ray. At all. The good Dr Tesla said so, to quote: “I want to state explicitly that this invention of mine does not contemplate the use of any so-called "death rays." Rays being absolutely useless apart from cooking bacon using all the power in New York City.

He tried to sell England on it, and the US, and Russia was interested (to defend their border against the Japanese), but countries either refused or it never got built, which is kinda obvious, given the lack of huge giant death particle cannons currently standing guard on the coast lines, or the power shortages when it fires, if the country doesn't build the power plant for it.

It required 60,000,000 volts to fire, also. That's a fair few lightbulbs.

Why should I be afraid of it? And what was it for?

“An exception, however, he added, must be made in the case of battleships, which, he said, would be able to equip themselves with smaller plants for generating the death-beam, with enough power to destroy any airplane approaching for attack from the air.” - New York Times, July 11, 1934, again.

You... need me to explain that? Really? Alrighty.

This is a four hundred kilometre ranged death particle beam gun. Dear lord, that's... scary. For an estimate of it's range, we'll say that one is set up in London, it could hit Paris, 340 kilometres away. And it could rip apart an army that was approximately 62 kilometres further from Paris. This is the Paris Gun.

That is a nasty weapon. Darth Vader should have used the sucker on his Deathstar.

Tesla believed it would be a peace gun, since every country having it's own 400 km ranged superweapon would be kinda scary. Go and get a map, and check. There's probably some large city within any area you pick, unless it's Australia. Now, go imagine a gun that makes the speed of sound it's slave (stronger word can be substituted),, reaching 400 kilometres away in about... 25 seconds.

Oh, and it could have been constructed in a few months by his estimates.

At the moment, the US navy is experimenting with lasers. Which, presumably, could be fitted on a ship, and fired at aircraft. Only decades, generations, since Tesla's proposal, and may not be able to quite match the specifications of Teleforce, which penetrated 2 metres of armour with a third of the full charge.

Now, 6 metres (19 feet) of anything is a lot to get through.
Go imagine swift, invisible death coming towards you and a million others in under half a minute, if someone accidentally hit the fire button.

On the plus side, after you die, you'd get great television, since it could be used to broadcast TV signals. So that's reassuring.

Nikola Tesla died in a hotel room at the age of 86. an eccentric genius, or a mad scientist.

No picture of it, sorry.

Sources used:
"Beam to Kill Army at 200 Miles, Tesla's Claim On 78th Birthday:" New York Herald Tribune
Nikola Tesla: Wikipedia
Teleforce: Wikipedia
Own personal knowledge, which was even less of a help this time.