Introduced To The World


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introduced to the world Breaks

HYDRAULIC BRAKES
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.
Basic idea
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.
Dual master
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.

Continued from page 1
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.
Second chance
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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Heliocentrism

The impact of the Heliocentric Theory Heliocentric: Relating to the sun as a
center; appearing as if seen from the sun's center.(Webster,447) The
heliocentric theory was first introduced to the world by a Polish astronomer
named Nicolaus Copernicus. Copernicus published his views on the heliocentric
theory in his book Commentariolus, in 1514, which sparked the time period now
known as the Copernican Revolution. Heliocentrism was proven true by the
discoveries of Galileo, Kepler, and Newton; through their efforts to prove the
validity of the heliocentric theory people began to find truth in science
through experimentation rather than religion with no proof. Many scientists went
through great ordeals for their scientific beliefs, thus making the heliocentric
theory the most electrifying idea in human history. Ancient people's believed in
Gods and deities for causes to nature and the unexplained. Once the fourth
century BC rolled around, people began to see "astronomical phenomena"
as "natural compound products of simple operations repeated in
perpetuity" rather than the actions of Gods. (Morphet, p.6) Greeks did not
revere celestial bodies very strongly in their religion, despite having deities
for the Sun and Moon. (North, p.78) Different peoples beliefs varied greatly in
ancient times. Different countries progressed in thought at different speeds.
During the Renaissance, many began to "toss aside medieval preoccupations
with supernatural forces and turned to secular concerns" like fame. (Yamasaki,
p.50) With the "Age of Discovery," people began to think for
themselves and ponder truths through philosophy, science, astronomy, astrology,
etc. Philosophers' minds began to turn, the human mind was finally awake. Plato,
a famous Greek philosopher, believed stars were Gods that the creator gave life
to. This view was very influential and proved to be sort of a religion for
intellectual idealists, no longer for the populace. At the time, the thought of
heavenly bodies being divine, and stars being eternal objects in unchanging
motion were common knowledge. Thinking otherwise was considered Atheistic.
(North, p.78) Fellow famous Renaissance man, and Plato's pupil, Aristotle, was
also a very important figure. Born in Stagira in 384, Aristotle is regarded as
the most influential ancient philosopher of the sciences. Aristotle refined
Callippus' geometrical and spherical concepts, and developed the geocentric
theory, which was believed for two thousand years. (North, p.80) Aristotle
believed that the sphere is the most perfect figure because when rotated to any
diameter it occupies the same space; and that circular motions are a sign of
perfection, which is why Heaven is considered divine. The spherical nature of
the Earth and Universe according to Aristotle, is the natural movement of
Earthly matter from all places downwards, to a center, around which a sphere of
matter will build up. "Only circular motion is capable of endless
repetition without a reversal of direction, and rotary motion is prior to linear
because what is external, or at least could have always existed, is prior, or at
least potentially prior, to what is not." In Aristotle's book De Caelo (On
the Heavens), he speaks of the celestial sphere, the Earth's center being the
same shape, and dismissing the idea of the Earth rotating at the center of the
universe. He also dismisses the idea of an orbital motion of the Earth. (North,
p.81) Contradicting Aristotle, Heracleides, an astronomer, believed in the
rotation of the Earth on it's axis and is known to be the earliest astronomer to
stand by it. He was thought to have taken the first step in "Copernicanism."
It is believed in the years to follow that Copernicus was said to have mentioned
Heracleides' name in this connection. (North, p.85) Aristarchus of Samos was the
first astronomer to clearly put forth a true sun-centered theory, learned from
Archimedes. (North, p.85) "...Aristarchus' hypotheses are that the fixed
stars and the Sun are stationary, that the Earth is carried in a circular orbit
around the Sun, which lies in the middle of it's orbit, and that the spheres of
fixed stars, having the same center as the Sun, is so great in extent that the
circle on which the Earth is supposedly carried is in the same ratio to the
distance of the sphere has to its surface." (North, p.85-6) If Aristarchus
did believe in heliocentrism, he still could not prove the differences in the
Earth's motion and seasons, which explains its failure to be accepted. (North,
p.86-7) Although scientists such as Eudoxus, Callippus, and Aristotle all came
up with Earth-centered systems based by providing a center for all motions,
Ptolemy was triumphant for he was able to explain sphere sizes and achieved a
single system, which was not ... more

introduced to the world

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