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The Great Wall of China
To the northwest and north of Beijing, a huge, serrated wall zigzags it's way to the east and west along the undulating mountains. This is the Great Wall, which is said to be visible from the moon. This massive wall has not only been one of the Ancient Seven Wonders of the World, but it has also been inspiration for many artists, and writers. The building of the Great Wall is one of the biggest tragedy?s, but through this tragedy arose triumph with the wall, being so much to so many people. The Great Wall of China is much more than a wall, and was built for many reasons that are hidden to most.
Construction of the Great Wall started in the 7th century B.C. The wall states that under the Zhou Dynasty in the northern parts of the country each built their own walls for defense purposes. After the state of Qin unified China in 221 B.C., it joined the walls to hold off the invaders from the Xiongnu tribes in the north and extended them to more than 10,000 li or 5,000 kilometers. This is the origin of the name of the "10,000-li Great Wall". (Karls, Robert 10,000-li Great Wall)
To understand everything about the Great Wall it is necessary to know the many components of the wall, and their purposes. The Great Wall was renovated
from time to time after the Qin Dynasty. A major renovation started with the founding of the Ming Dynasty in 1368, and took 200 years to complete. The wall
we see today is almost exactly the result of this effort. With a total length of over 6,000 kilometers, it extends to the jiayu Pass in Gansu Province in the west and to the mouth of the Yalu River in Liaoning Province in the east. What lies north of Beijing is but a small section of it. (Karls)
The Badaling section of the Great Wall snaking along the mountains northwest of Beijing was built at the beginning of the Ming Dynasty in the 14th century. Being 7.8 meters high and 5.8 meters wide at the top on the average, it has battle forts at important points, including the corners. (Karls)
Located 10 kilometers south of the Badaling section of the Great Wall and built in an 18.5-kilometre-long valley, the pass has always been an important gateway northwest of Beijing. The name is believed to have its origin in the workers and slaves conscripted to build the Great Wall in ancient times. Cloud Terrace, built in 1345, was originally the base of a pagoda over looking the main road of the town of the pass. The arched gate of the terrace and the walls inside the arch are decorated with carvings. Of elephants, lions, birds, flower and heavenly kings as well as charms in six languages-Sanskrit, Tibetan, Phats pa (Mongolian), Uygur, West Xia and Han. (Karls)
The Mutianyu section of the Great Wall, 70 kilometers northeast of Beijing, is linked to the Gubeikou section on the east and the Badaling section on the
west. The Mutianyu section of the Great Wall is crenellated for watching and shooting at the invading enemy. Some of the battle forts on the wall are as close
as 50 meters apart. It is one of the best sections of the Great Wall. (Karls)
Located in Miyun County northeast of Beijing, the Jinshanling division of the Great Wall, like the Simatai division, belongs to the Gubeikou section of the colossal defence barrier. The battlements in the Jinshanling division of the Great Wall are built along the ridge of a mountain, where the soldiers can resist the invading enemy by taking advantage of the high terrain. (Karls)
Located to the east of Jinshanling, the Simatai division of the Great Wall is 3,000 meters long and has 35 battle forts. The wall rises and falls with the precipitous mountain ridge, while the battle forts are located high up the hills.
From the Beakon Tower alarm was raised by means of smoke signals, at night by fire. Smoke was produced by burning a mixture of wolf dung, sulfur and saltpeter. Shots were fired at the same time. Thus an alarm could be relayed ... more
Find essay on To Put One Through Such
Brake Hydraulic System Principles & Service Tips.
Author/s: Bob Freudenberger
Issue: Sept-Oct, 1999
Everyone who works on brakes MUST know these concepts and procedures
In the early days of the automobile, some very clever engineering was employed to apply brakes mechanically. For example, the Italian Bugatti routed the cables over the top of the front axle so that the twisting action generated by stopping added force to the shoe cam lever.
No matter how ingenious the design, however, there was always a major drawback: Nothing could insure that braking force would be exactly equal at any pair of wheels, so there was a good chance that stepping on the pedal would cause swerving and skidding. This made the idea of hydraulically actuated brakes attractive--according to Pascal's Law, pressure at all points in a closed hydraulic system must necessarily be the same--but it took many years to develop dependable systems. The first car of any consequence to carry four-wheel hydraulic brakes was the. 1921 Dusenberg of the U.S.
On the most basic level, all brake hydraulic systems share the same principle: Muscle strength amplified by leverage and perhaps a power booster displaces fluid from the master cylinder and causes pressure to increase all through the circuits. This overcomes the retracting springs in drums and the seals' elasticity in disc calipers and pushes the friction material against the rotating member.
That much is obvious, but the subtleties of modern designs that provide proper performance in the real world deserve some explanation. Hence this article, which also includes important service information every mechanic should know about.
Although it has been in use for decades all over the world, the dual (also called "split" or "tandem") master cylinder is still widely misunderstood, so we had better explain its construction and operation. A typical late-model specimen will be of the composite variety (aluminum with a plastic reservoir), but iron one-piece units are still around in abundance. Two pistons ride in the bore, and here is where we encounter some confusing terminology. The rear piston is the primary, and the one in the front is the secondary. This apparent misnaming resulted because the rear piston is the first to receive the force of the driver's leg.
Each piston has a primary seal at its front and a secondary at its rear, so you will be hearing such combinations as primary piston secondary seal, secondary piston secondary seal, etc. The primary seals are the most important because they trap the fluid that is about to be squeezed into the lines. The primary piston's secondary seal keeps fluid from escaping out of the back of the cylinder (commonly into a booster), and the secondary piston's secondary seal acts as a barrier to make two essentially separate cylinders out of one.
In normal braking, the push rod from the pedal or booster forces the primary piston forward. No pressure is created until the primary seal covers the compensating or vent port from the reservoir. Once it does, fluid is trapped in the chamber between the pistons and becomes, for all intents and purposes, a solid column. Pressure is routed from this chamber to two wheels. The trapped fluid and the primary piston coil spring both bear on the secondary piston, moving it forward and creating pressure in the chamber ahead of the secondary piston's primary seal, to which the line to the other two wheels is attached.
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When the pedal is released, a partial vacuum occurs in both pressure chambers because the fluid's inertia and viscosity prevent it from returning from the lines immediately. In order to re-arm the brakes instantaneously, the primary seals are designed to allow fluid to flow one way (forward) from behind each seal into the pressure chambers.
The replenishing ports allow fluid to move freely between the chambers behind both pistons' primary cups and the reservoir according to demand and expansion and contraction from temperature changes.
If a hose should rupture or one of the brake lines should become perforated from corrosion resulting in a catastrophic loss of fluid in half the system, the other half will still provide a means of decelerating the vehicle, albeit with a lower pedal and reduced stopping power.
Both pistons have extensions which project out ... more
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