Weapon in history - Degtyaryov light machine gun

Degtyaryov light machine gun
At 2nd of February 1940, a Pan-Union Elder Michail Ivanovich Kalinin was awarding medals and orders in the Kremlin.
"To the Hero of the Socialistic Labour comrade Degtyaryov, who received this high title for remarkable inventions and desidning of new, especially important weapons for the Red Army." Vasiliy Alexeevich Degtyaryov was awarded with the golden medal "sickle and Hammer" with number 2.The first Hero of Labour became Stalin himself, two weeks earlier.Degtyaryov created many examples of firearms during years of his working carreer.However the first and probably the most known of his creations is a "DP" light machine gun - Degtyaryov Pekhotniy (Gegryaryov for Infantry).

Weapon in History - DP light machine gun
SERGEY MAKAROV:Firearms expert of Central Museum of the Great Patriotic War said "The World War I had already revealed a necessity for Infantry units to have not only heavy machine guns but also more maneuverable machine guns aka light machine guns.Essentially this kind of weapon was born in fields of the World War 1 but neither the Russian Army, neither the Red Army at first stages of its existence hadn't their own light machine gun.Light machine guns of English French US origins were in the arsenal.There were attempts to convert a "Maxim" machine gun to a light machine gun.We can say that such attempt was successful and in 1925 a "MT" light machine gun was introduced into service. MT stands for Maxim-Tokarev.That means that conversion was done by Fyodor Vasilyevich Yokarev.Any way despite machine gun was named as a light one it still was bulky heavy unsatisfying high requirements addressed to this type of weapon."

Meanwhile the requirements were following,A light machine gun must be maneeuverable, i.e. light enough.By constantly remaining in an Infantry chain, it must increase unit's fire power in attack. It must be able to fire with it from any position standing up laying down on the move.Creation of a light machine gun following these requirements wasn't an easy task.

SERGEY MAKAROV said "The problem was solved in 1927 when the DP machine gun of Degtyaryov's design was introduced into service. DP - Degtyaryov Pekhotniy. The design is quite original and not borrowed. And for that moment of time, i.e. middle of 20s, it was a quite modern machine gun."
Caliber: 7.62 mm
Weight without a magazine - 8.4 kg.
Weight of magazine with round - 2.8 kg.
Magazine's capacity - 47 rounds.
Aiming range of fire - 1500 m (max distamce marked on iron sights).
Rate of fire - 600 rounds per minute.
Combat rate of fire - up to 80 rounds per minute.

Degtyaryov light machine gun was a totally new example positively different from all known machine guns of that time. Thanks to successfully selected system of automation.Degtyaryov managed to achieve light weight of the machine gun. The DP was also differing by extreme simplicty of production.For example time needed for manufacturing of Maxim machine gun was 700 hours. Meanwhile a DP needed only 130. In the battle DP was served by a machine gun operator and his assistant.Load magazines were kept and transported in a metallic box. It is visible in the background. Three disks in each box.

SERGEY MAKAROV said "DP machinegun was designed for use of rifle cartridge. It had such specifically shaped disk for 47 round. Well maybe this form is not the most convenient one but it was dictated by following conditions. First of all existing cartridge had to be used. And secondly magazine had to have the biggest possible capacity. So for a reason that carteidge had an extending rim a quite reasonable decision was taken to place rounds in a circle with bullet heads directing to the center. Thus a magazine received this shape. By the way it's not a first experience. There were machine guns with similar magazines before.Particularly a Lewis machine gun model 1915. Anyhow disk for this machine gun became quite capacious - 47 rounds. Having a technical rate of fire about 600 rounds per minute, its combat rate of fire was quite satisfactory for those times."

"Learn to shoot sharply. Here conscripts of Moldavian kolkhoz "Lyuchapyar Rozh" learnt a Degtyaryov light machine gun. Perfect aiming!"

Quite original tricks were used sometimes for firing. A rope was fastened to the machine gun and soldier was pressing a buttstock to his shoulder tighter with help of his leg. Fluctuations of the machine gun were reducing and fire accuracy was increasing. "8 bullets - 7 hits. Range - 300m. Target "light machine gun". By the way the enermy machine-gunner on the target is armed with an English Lewis machine gun which appeared in Russia in 1917. But with introduction of DP machine guns into service Lewis  started being gradually retrieved from Infantry units and moved to warehouses for a while.

In 30s DP machine guns got a firm stand in arsenal of the Red Army. Their production was mostly satisfying troops's needs. But a necessary mobilization reserve of Degtyaryov light machine guns wasn't created.While in the first half of yhe 1941 when production lines were under reconstruction for production of new models of firearms production of DP was reduced to the minimum. Light machine guns were necessary at the frontline. At first days lack of them was compensated by those English Lewis machine guns. They are well seen on this photo of parade in November of 1941. DP machine gun became a base for creation of the first Soviet family of firearms for infan try tanks planes armored cars and ships.

A DA machine gun - Degtyaryov's for Aviation was created on basic of DP with minor changes. In contrast of infantry variant the aviation machine gun had a magazine with bigger capacity - 63 rounds. Buttstock's shape was different and was supplemented with a pistol hand grip. A twin aviation machine gun was introduced into service in 1930. A "tankoviy" (for tanks) version of Degtyaryov machine gun "DT" differed from version for infantry by a foldable metallic buttstock and a pistol hand grip. Capacity of its magazine is incresed to 60 rounds. DT was installed on many Soviet tanks and armored cars. DT machine gun could be used in field conditions too.If tank was out of order during battle then the crew was dismounting the machine gun leaving the vehicle and after mounting the machine gun on a bipod it could fire against the enermy.

Motorcycles were also equipped with a Degtyaryov machine gun. Meanwhile this device was allowing even to fire against aerial targets in case of necessity. However this machine gun despite that it was reliable and quite easy in use, also had disadvantages which were noted already during battles. The most important one we can consider was a fact that it couldn't maintain rapid rate of fire. The barrel of this machine gun had quite thin-walled and barrel change in the middle of the battle wasn't predicted. Because of that a length of burst was limited. It was necessary to wait for a barrel to be cooled down in order and don't bring the weapon out of order. Except that the recoil spring which is located here under jacket of the barrel, so it's located very closed to the barrel and during intensive fire, it was also overheating from the barrel and had a tendency to loose its temper which was affecting an uninterrupted operation of machine gun. By experience of its use in World War II, many of these factors were taken into consideration toward the end of the war and the machine gun was transformed into its modernized version known as DPM which had not so significant exterior differences nevertheless. Retaining its general scheme and feeding mechanism. For fire control this machine gun already had a pistol-like hand grip.

The bipod wasn't detachable loke on this machine gun but a non-detachable one and bipod's fastening became a bit different more convenient in use. While the recoil spring was relocated to a special tube in a trigger frame where of course it wasn't so affected by heating and was operating much more reliable.

DP was a fearsome weapon in hand of Soviet soldiers in battles at lake Khasan at river Halkin Gol. They were fighting with it in Finnish war too. DP light machine gun was beating the enermy at frontlines of the Great Patriotic War as well.

"Here is Ivan Gornostaev. He was a tractor driver before the war. Now his occupation is to destroy hitlerites. He killed 52 Germans in the first battle. The war turns teenagers into men."

Hundreds and thousands of the Red Army soldiers were protecting the Motherland with a machine gun in their hands. Degtyaryov Pekhotniy was supporting and covering many soldiers in their attacks. The road to the victory was very long but Degtyaryov light machine gun passed the entire war till Berlin itself together with infantrymen. It got its place rightfully in Victory parade of 1945.

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[Death of the universe?](7 End)

Death of the universe?(7 End)

Astronomers have much to learn about the influence of dark energy and dark matter.And much of the newest information is coming from this probe in deep space.It's sending back information that's helping scientists to interpret the history and the fate of the universe.The night sky by all appearance is a quiet and peaceful place.But in reality there are forces that are driving it to an end.Big Science moves astronomers closer to deciphering the universe's great mysteries.Including its ultimate fate.

The solution to the universe's riddle may well be hidden in this multi-colored image.What's incredible is that it's a map of the early universe from the moment it was conceived.And even more fantastic, it reveals a great story that helps cosmologists predict how it will end?The machine that captured this is called WMAP a NASA satellite that's working around the clock to chart the cosmos.

WMAP is one of the great astronomical breakthroughs of the 21st Century.Nothing before it could give us such a clear image of the energy leftover from the Big Bang.Energy that scientist call the cosmic microwave background.WMAP is measuring temperature differences in the cosmic microwave background which may finally make it possible to predict which force will dominate the universe and how that force will bring the cosmos to its end.

Temperature difference revealed by WMAP tell scientists about the nature of the matter and energy that is contained within the universe.They're able to be analyze the light patterns and find clues not only about the substance but also the fate of the universe.We only capture a tiny part of the electromagnetic spectrum with our eyes.And we have to go with much longer wavelengths.Same wavelengths that are used to heat in a microwave oven are what we're measureing here with WMAP.

WMAP is so precise that it can detect differences in temptures as small as one one-thousandth of a degree.This sensitivity helps scientists to calaulate the ratio of dark matter to dark energy.Force that will determine how the universe ends.

Pulling away from the probe and following the path of the light it is collecting, we pass Mars, Jupiter and Saturn whose reflected light takes over an hour to reach Earth.Then leaving the Milky Way, we pass Andromeda, the next nearest galaxy, whose light takes 2.3 million years to reach us.Which means we have traveled 2.3 million years back in time.

And finally we arrive back thirteen billion years ago at the beginning of visible light.Before that super heated hydrogen gas is everywhere.WMAP can see this far back in history.It's confirming important facts about the universe and what's driving it to its demise.The final act for the universe becomes more easily predicted thanks to WMAP.It's information combined with the work of astronomers has led to some astounding discoveries concerning a rapidly expanding universe.Rapid expansion supports the dark energy theory and the possibility of a Big Chill or Big Rip.

We now know from all the data we've had in the last ten years that there's by a factor of two to one more dark energy than dark matter.So dark energy is the dominant constituent of energy in the universe.The evidence seems clear.Dark energy is taking over and is leading astronomers into new thoughts about the beginning and the end of the universe.

Before the discovery of dark energy, things were a lot simple.If we could determine the amount of matter in the universe then we could say something about its ultimate destiny.Those simple days are gone.But the proof is adding up and supports the idea that the universe will continue to expand.But will it do so to oblivion? We've made huge strides over the last century is learning somethng about evolution of the universe and its expansion.But we've now raised more questions in some sense than we've been able to answer.And so the next decade's going to be even more exciting.

The battle between dark matter and dark energy is expected to go on for billions of years.And humans will be long gone from Earth when the final outcome occurs.But no pursuit has been more significant to science than understanding how the universe arrived, how it works and how it will end.It's a never ending quest.It's a driving astronomy.What are the answers to these profound questions? The constituents of the universe, the nature of dark matter and perhaps the biggest mystery of all, what is the ultimate fate of the universe?

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[Death of the universe?](6)

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Hubble sees more than just stars and galaxies.It just might be on to one of the key ingredient of space.An invisible ingredient that could put the brakes on dark energy's effect and cause a Big Chill.That's dark matter.Scientists talk about dark matter as the substance that holds the universe together and could prevent a Big Rip.Evidence that dark matter exists is seen in some of Hubble's images of nearby galaxies.It sometimes appears as though other galaxies surround them.The other galaxies are not really there at all.Rather they are reflections of more distant galaxies coming from behind.

Astronomers suspect this optical illusion is dark matter causing aweird distortion of light called gravitational lensing.The light from the more distant galaxies is literally bent by the curvature of space caused by stars and dark matter in its path.The more dark matter there is between Earth and the distant galaxy the more the light will be bent and the greater the force to cause a Big Chill.

The gravitational lensing is a tremendous tool for the astronomer because we can measure the distortion in background galaxies and use it to trace the distribution of dark matter on various scales.We're looking at a you're wearing them.And you can tell how much that bending is occurring, you can map the dark matter and you can also see well if there's dark matter there is the universe around that dark matter behaving the way it should given the gravity or not?

Identifying which energy force dominates dark matter or dark energy will give scientists more confidence about whether a Big Chill or Big Rip will be our fate.The best evidence shows dark energy as the driving force.But by how much?Solving this mystery depends on astronomers finding ways to measure how fast the universe is moving.On Earth it's simple to determine how fast something moves.An airplane for example is relatively close.We can look at it and calculate its speed by estimating the distance it travels and timing how long it takes to get from one point to another.But the star's light can travel for millions or billions of years before it can be seen on earth.By the time its light gets here, the star will be long gone.And it's too far away to gauge its speed or distance traveled with any certainty.

The universe is expanding.Only scientists cannot give precise answers about how fast.The mystery moves closer to being solved by imaging the cosmos with greater precision.You couldn't even observe the galaxies that are in this image before Hubble Space Telescope was launched.So the increase in our capability with technology recently has been astounding.It has enabled us to do things to chart the evolution of the universe in a way that we never could have imagined.

Clearer images from space make it easier to estimate the rate of expansion.If the universe continues to expand with time, then  ultimately all of the energy sources. the nuclear furnaces and stars would run out and die and the universe would actually get very cold.And there would be somthing called the Big Chill.

In the Big Chill Scenario.Earth could become a lonely cold planet as the universe expands.Distances between stars grow so vast that they nearly disappear from view.Over time they burn out.And eventually  the entire universe ends in a frozen state.These are ideas that sprang from the work of Einstein and Hubble.Only neither of them lived long enough to see these results.

Imagine what Edwind Hubble and Albert Einstein would think if they were alive today watching the progress in th subject.You know Einstein thinking about the expanding universe as a natural solution to his equations but puzzles that the universe didn't appear to be changing.Edwind Hubble desperate to measure whether the universe was slowing down in its expansion.In fact they were both wrong.It's speeding up.

The time that Einstein developed the general theory we didn't know that there were other galaxies outside of our own Milky Way galaxy.And we didn't know that the universe was expanding.And in fact Einstein himself, despite the fact that his equations were screaming at him that the universe had to be evolving, didn't have enough confidence in that result to say the universe must be expanding or the universe must be contracting.

Still his work led to the scientific breakthroughs that would identify dark matter and dark energy. the forces that could cause a Big Chil.This sphere demonstrates the principles behind a Big Chill.The mables coming out of this sphere are like stars that were formed following the Big Bang.Dark energy propels the stars outward.Dark matter slows them down.In a Big Chill the expansion would continue but the nuclear fuel that cause the stars to burn will eventually run out.From Earth's perspective the  first thing to go would be sunlight.The sun dims as it exhausts its last bits of nuclear fuel.

Earth would freeze and become lifeless and billions of years after humans are gone, the cosmos expands out of view.A few newer stars might remain but most would have long moved away.The furnace powering the universe burns out.The darkened universe continues to expand.A frozen and lifeless remnant of its once vibrant existence.

Eventually if this keeps going if nothing changes in the composition of this energy density, the universe will continue to expand forever.It's going to get colder and colder and eventually even the gala our neighboring galaxies will be receding from us so fast that they won't be able to see them.So the universe is going to get cold and dark and it will be a very lonely place.

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[Death of the universe?](5)

Death of the universe?(5)
What would atoms ripping apart look like? Things like coffee cups are solid, Atom join together to create somthing that will hold a cappucino without leaking a single drop. Zoom in through the cup like sailing through the cosmo, pass the molecules, and into the stoms. The solid cup is nothing more than a fabric of atomic particles that formed a bond to become matter. If these particles were to move apart, the bond that hold this cup together stop working. The atoms no longer support molecules.The connection between the miniscule particles dissolve.Matter in the form of this cup seizes to exist.It disintegrates.Gone from the existence.This is the dramatic end that Robert Caldwell foresees for the universe.

What you would see if you were standing on Earth or standing on some other planet that happened to still be around at that time, you would see something that looks like a wall of darkness approaching you.And as the wall of darkness approaches stars would go out, galaxies would go out, and then eventually that wall of darkness would surround the planet.And then pretty soon atoms themselves are torn apart and that's it.Just the wall of darkness shrinks down to a point and that's the end of the universe.

According to Robert Caldwell, that moment is still billions of years off.Leaving plenty of time to refine their research.In the way, this is like a detective story.We're trying to figure out what is the culprit or who is the culprit responsible for the cosmic acceleration.We think we know its name.We call it dark energy, but we don't know the modus operandi.We don't know exactly how it works.And what's needed is more information.More information about the physics behind the dark energy.We want to know exactly what it does and exactly what it's made out of.And in answering those questions we'll be able to figure out exactly what is the fate of the universe.

The Big Rip is one theory.Cruising just above Earth's atmosphere and peering deep into space, the Hubble Telescope provides scientists with clues to a less violent, but equally unavoidable, end of the universe.Scientists now say the universe is expanding.And that depending on how fast it is accelerating, it might end in a big rip where everything tears apart.It's also possible that it will continue to expand, but at a slower rate.The universe wouldn't rip apart, but would become dark, cold, and lifeless.

If dark energy turns out to be constant , a constant property of space and continues at the same rate that it is now, the universe will keep expanding forever and it will be a very sad state.In the end it just chills out.Everything cools down.

Evidence for the Big Chill and all of the theories for the end of the universe in part come from the Hubble Space Telescope.It has been orbiting Earth since 1990 and have an unobstructed view of the cosmos.The extraordinary images it beams back to Earth are amazing in their clarity and detail.And because of Hubble, scientists can make better predictions about how the universe will end.

So here is an example of a very deep field that was taken by the Hubble Space Telescope which literally you point the space telescope at a single region in space.And if you looked at this from a typical ground based image before Hubble was launched, first of all it's a, literally a, almost size of a postage stamp.And so suddenly the first Hubble deep field that was ever taken had four thousand galaxies that looked just like the galaxies here that were never visivle before from the ground.Tremendous power each of these smudges in their own right in another galaxy.Each one of these galaxies contains about a hundred billion stars.

Astronomers eagerly await all images from Hubble.Each bringing them closer to solving the mystery about the fate of the universe.Through image processing with computers and differencing frames on, taken on different nights, we can take out the other galaxies in the image and we're left with just the blob.Look like nothing to you but that's supernova.And this is an object that could never have been discovered before Hubble Space Telescope was launched.

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[Death of the universe?](4)

Death of the universe?(4)
So, when the universe was young, gravity was the most dominant force. And so what we see here is galaxies as particles on the surface of the water are bound together by gravity. And the point about seven billion years ago, dark energy and gravity are pretty well in balance. But the universe continues to expand, the density goesdown, and so dark energy starts to take over. And lo and behold, the universe starts to accelerate. So dark energy is now the dominant property of space. So, the universe started out with the certain amount of energy. And we know, we're trying to understand how much energy there is. And we know the universe is expanding as it moves outward with time. We also know now that the universe's expansion is accelerating. And we don't know, is that acceleration going to slow down or not. We're still trying to understand that. So in understanding what's going to happen to the fate of the universe, we have to know how much energy is there?How much matter is there?

Well, the history of the universe is really a battle between dark matter  and dark energy.These two forces are in opposition. And so both the history of the universe and its ultimate fate is really the competition between these two forces. The Big Crunch theory was a result of scientists interpreting that dark matter is the dominant force. But astronomers now suspect that dark energy might be much stronger. If so, the end could be dramatic and violent .

It pull apart solar systems, it pulls apart stars. And eventually it grows so strong that it pulls apart matter itself, breaks bonds pulls apart atoms, and reduces everything to fundamental particles and that's the end of the universe.

The battle between dark matter, the force that holds the universe together, and dark energy, the force seeeking to tear it apart, has set the universe on the path of destruction. If dark matter is the victor, the universe might collapse. If dark energy rules the cosmos, it could rip to shreds. The expansion grows so strong that it tears up the entire universe. It'll be a strange twist of fate. Dark energy, the force that propelled matter to form a magnificent universe, continues to push it outward and drive it to its demise.

To find out the dark energy is in fact winning the battle, scientists will first need to know how fast the universe is actually expanding. The most remarkable feature of the universe is that it's expanding, Every galaxy is moving away from every other galaxy. We can illustrate that with this balloon as we expand it. We see that every dot drawn on this black balloon, like the night sky, is moving away from every other dot. Buy there is something else that we know about the universe, something else that we know about that expansion. That is that the expansion is getting faster. The universe is accelerating. The size of the universe is getting bigger at a faster and faster rate. And we don't know exactly how fast it's accelerating. But if it's accelerating fast enough, then something really dramatic could happen. The universe could end up tearing itself apart in a Big Rip.

Doctor Robert Caldwell attempts an Earth-bound experiment to show how dark energy affects the acceleration of the universe. He use a paintball gun mounted on a truck. He send the truck coasing down an inline. Earth's gravity pulls the vehicle downhill, which is similar to how dark energy propels the universe outward, causing it to expand. Gravity pull the truck forward at an increasing speed. The gun fires paint at the ground at regular one second intervals. Caldwell measures the distance between the paint dots to calculate just how fast the truck was accelerating.

This demonstration then gives a sense of the dramatic rate of expansion that appears to be happening in the cosmos.By eye it might be difficult to appreciate how good a fit it is. But we can tell you that the rate of statistics indicates that an accelerating universe is a very good fit to this data.

If like the truck the universe is conyinually accelerating, then billions of years from now the universe might tear itself apart. All the distant stars and galaxies would be pulled away from each other. They'll be pulled away from us. But more over, we won't have time to grow cold and lonely. It'll actually be pretty exciting and dramatic and violent. Stars are ripped apart, planets are ripped apart, and even atoms are torn apart before the universe end. It wouldn't happen for at least fifty billion years. But still, it's an interesting fate for the universe.

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