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Baba Deep Singh Jee

CHUNKAR AZ HAMA HEELTE DARGUZASHST, HALAL AST BURDAN SHAMHER DAST. à
When all peaceful means of settlement are exhausted, it is justified to take up the sword (against tyranny for justice) – Guru Gobind Singh ji Baba Deep Singh was a Sikh belonging to the village Pahuwind in the District of Amritsar. He was tall, strong, and uncommonly brave. He had received baptism from the hands of Guru Gobind Singh Jee himself. He was a bold and fearless Sant-Sipahi (saint-warrior). Besides being a strong and fearless warrior, he was a great scholar and practiced Bani regularly. In fact he was one of the most scholarly Sikhs of his time. Along with Bhai Mani Singh ji, he spent lot of his time preparing copies of Guru Granth Sahib. Some he wrote with his own hands. Others he got written under his direct supervision. Copies of the Guru Grath Sahib ji written by his own hands or issued by him with his approval were accepted as most authentic. At the time that we are talking of, Ahamad Shah Abdali was in India on his fourth invasion. On his return from Delhi, he stayed for sometime in Lahore. He had experienced a good deal of trouble at the hands of the Sikhs. Hence, while staying at Lahore, he sent out a force to punish the Sikhs at Amritsar. The city was plundered. The sacred places, including Sri Harmandir Sahib, were demolished. The sacred tank (sarovar) was filled up. The news of what had been done to the holy places at Amritsar soon reached Damdama Sahib. On hearing it, Baba Deep Singh Jee felt as if an arrow had pierced his heart. At once, he decided to go to Amritsar and avenge the insult to the sacred places there. He started immediately. Many brave Sikhs with whatever weapon they had with them collected at Damdama Sahib. Baba Deep Singh drew a line on the ground with his double edged Khanda, weighing 18Kgs and addressed the gathered Sikhs, "Only those should cross this line who are prepared to die but not turn back to the enemy in the battlefield A band of five hundred Sikhs volunteered to accompany him. He announced the coming Diwali festival gathering would be celebrated at Amritsar. Sikhs went on joining him as he went along. By the time he reached Tarn Taran Sahib, he had about five thousand men with him. "O Lord, of Thee this boon I ask, That I never shun a righteous deed. Let me be fearless when I go into battle, Give me faith that victory will be mine. Let one directive guide my mind, That I may ever sing Thy praise, And when comes the time to end my life, I should die heroically fighting on the Battle field."– Guru Gobind Singh ji The news of march of these brave Sikhs determined to take revenge for desecration of their holiest shrine and to restore its sanctity, reached the rulers in Lahore. Jahan Khan commanding an army of 20,000 soldiers proceeded towards Amritsar. Five miles from Amritsar, the two opposing forces confronted each other. The Sikhs fought with such bravery that soldiers of Jahan Khan's army ran for their lives. Hundred of soldiers of either side fell dead in the battle field. Bhai Dayal Singh The stories of one's ancestors make the children good children. They accept what is pleasing to the Will of the True Guru, and act accordingly. ( Guru Granth Sahib Ji - 951) companion of Baba Deep Singh leading a posse of 500 Sikhs, attacked Amir Jahan Khan's force and succeeded in cutting Amir Jahan Khan's head. After this victory, the sikh forces arrived at Ramsar. By then Atai Khan came with a large army and artillery. His arrival turned the odds against the Sikhs. A fierce battle began. The Sikhs, with Baba Deep Singh Jee at their head, went on fighting and advancing towards Amritsar. Near Ramsar, Baba Deep Singh Jee received a mortal wound in the neck. Baba Deep Singh, more than seventy-five years of age at that time, started to lose his footing under the impact of the blow, when a Sikh reminded "Baba Jee, you had prayed that you should fall a martyr in the precincts of Sri Harmandir Sahib. But you seem to be departing here." On hearing this, an inhuman energy suddenly took over and Baba Deep Singh Jee rallied at once. He supported his head with is left hand. With the right hand he went on wielding his heavy khanda cutting down his enemy. Thus fighting, he reached the precincts of Sri Harmandir Sahib. His vow was fulfilled. He fell there to become a martyr. This happened in the year 1757. At the place where he was wounded stands a Gurdwara "Shaheed Ganj Baba Deep Singh". sUrw so pihcwnIAY ju lrY dIn ky hyq ] s oo raa s o peh i chaa n eeai j lar ai dhee n k ae h ae th || He alone is known as a spiritual hero, who fights in defense of religion. purjw purjw kit mrY kbhU n CwfY Kyqu ]2]2] p u rajaa p uraj aa katt marai kabeh oo n shh aa ddai kh aeth ||2||2|| He may be cut apart, piece by piece, but he never leaves the field of battle. ||2||2|| ( Guru Granth Sahib ji 1105

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Knowledge / Re: Engineering World ( how stuffs works)

« on: June 30, 2015, 09:36:00 PM »

BULLETS

Bullets are a bit like fireworks and they are arranged in three sections: the primer, the propellant, and the bullet proper. At the back, the primer (or percussion cap) is like the fuse of a firework: a small fire that starts a bigger one. The next section of the bullet, effectively its "main engine," is a chemical explosive called a propellant. Its job is to power the bullet through the air from the gun to the target. The front part of the bullet is a tapering metal cylinder that hits the target at high speed. It tapers to a point to help it penetrate through metal, flesh, or whatever else the target may be made from.

What happens when you fire?

Bullets are designed to be (relatively) safe until the moment when you fire them. When you pull the trigger of a gun, a spring mechanism hammers a metal firing pin into the back end of the bullet, igniting the small explosive charge in the primer. The primer then ignites the propellant—the main explosive that occupies about two thirds of a typical bullet's volume. As the propellant chemicals burn, they generate lots of gas very quickly. The gas shoots from the back of the bullet, increasing the pressure behind it, and forcing it down the gun barrel at extremely high speed (300 m/s or 1000 ft/s is typical in a handgun).

The propellant chemicals in a handgun bullet are not designed to explode suddenly, all at once: that would blow the whole gun open and very likely kill the person firing it. Instead, they are supposed to start burning relatively slowly, so the bullet moves off smoothly down the gun. They burn faster as the bullet accelerates down the barrel, giving it a maximum "kicking" force just as it comes out of the end. As the bullet emerges, the whole gun recoils (leaps backward) because of a basic law of physics called "action and reaction" (or Newton's third law of motion). When the gas from the explosion shoots the bullet forwards with force, the whole gun jolts backwards with an equal force in the opposite direction. The explosion that fires a bullet happens in the confined space of the gun barrel. As the bullet flies out of the gun, the pressure of the explosion is suddenly released. That's what makes a gun go BANG! It's a bit like uncorking a bottle of wine at much higher speed and pressure. Some bullets also make noise because they go so quickly. The fastest bullets travel at around 3000 km/h (over 1800 mph) —about three times the speed of sound. Like a supersonic (faster-than-sound) jet fighter, these bullets make shock waves as they roar through the air.

How bullets travel

Gun barrels have spiraling grooves cut into them that make bullets spin around very fast as they emerge. A spinning bullet is like a gyroscope: a sort of "stubborn" spinning wheel that always tries to keep turning the same way. If you try to tilt a gyroscope while it's spinning, it will try to resist whatever force you apply and, if you let go, it will soon tilt back the other way. This is why, when things are spinning, they are very hard to deflect from their path. We call this idea gyroscopic inertia or stability. A bullet behaves in exactly the same way: once it's spinning, it follows a straighter path as it goes through the air, so it's harder to deflect and much more likely to reach its target.

We think of bullets flying in perfectly straight lines—but nothing could be further from the truth. Several different forces act on a bullet as it goes through the air. Over very short distances, bullets do follow more or less a straight line. Over longer distances, they follow a slight downward curve because gravity tugs them toward the ground as they go along. Air resistance and the spinning, gyroscopic motion of a bullet complicate things too. Usually, because of recoil, the person firing wobbles the gun slightly when the bullet emerges. When all these factors—the bullet's motion, gravity, air resistance, recoil, and spinning—add together, they make a bullet follow a very complicated corkscrew path as it flies through the air.

Why bullets do damage

A moving object has momentum,which is the product of its mass and its velocity. The faster something moves and the heavier it is, the more momentum it has. A truck trundling along slowly has a lot of momentum because it weighs so much. Even though bullets are tiny, they have lots of momentum because they go so fast. And because they go fast, they also have huge amounts of kinetic energy, which they get from the chemical energy of the burning propellant. (Remember that kinetic energy is related to the square of an object's velocity—so if it goes twice as fast, it has four times the energy.)

Bullets do damage when they transfer their energy to the things they hit. The faster something loses its momentum, the more force it produces. (One way to define force is as the rate at which an object's momentum changes.) A rifle bullet coming to a stop in a tenth of a second produces as much force as a heavy, slow moving truck coming to rest in 10 seconds.