-
Four
Great
Inventions
of
Ancient
China
is
the
world's
four
great
inventions
impact. Namely, papermaking, the
compass, gunpowder, movable type.
四大发明是指中国古代对世界具有很大影响的四种发明。即造纸术、指南针、火药、
活字印刷术。
(
一
)Compass
Compass is used to determine
position of a simple instrument. Formerly known as
Sinan.
The
main
components
are
mounted
on
a
shaft
can
freely
rotate
the
needle
(commonly known as magnet). Needle on
the ground magnetic field can be maintained
at
the
tangent
magnetic
radial direction.
Needle
points
to
the geographical North
Pole
South
Pole,
take
advantage
of
this
performance
can
be
a
sense
of
direction.
Commonly used in navigation, geodesy,
travel and military and so on.
(
一
)
指南针
指南针是用以判别方位的一种简单仪器。
前身是司南。
主要组成部分是一根装在轴上可
以自由转动的磁针
(
俗称吸铁石
)
。磁针在地磁场作用下能
保持在磁子午线的切线方向上。磁
针的北极指向地理的南极，利用这一性能可以辨别方向
。
常用于航海、
大地测量、
旅行及军<
/p>
事等方面。
Compass
invented the ancient Chinese practice of long-term
understanding of the
results of
magnetic objects. Ancient Chinese people into
contact with magnetite, as
he began to
understand the nature of magnetism. It cited the
first to discover the
magnetic
properties of iron. Then they discovered that the
directivity of the magnet.
After many
experiments and studies, and finally invented the
compass can be useful.
指南针的发明是中国古人在长期的实践中对物体磁性认识的结果。古代中国人接触了
磁铁矿，
开始了对磁性质的了解。
人们首先发现了磁石引铁的性
质。
后来又发现了磁石的指
向性。经过多方的实验和研究，终于
发明了可以实用的指南针。
(
二
)Gunpowder
With
saltpeter,
sulfur
and
charcoal
made
from
these
three
kinds
of
material
mixed, but when people have these three
kinds of things as the treatment of drug, so
the name
（一）火药
用硝石、
硫黄和木碳这三种物质混和制成的，
而当时人们都把这三种东西作为治病的药
物，所以取名
“
火药
”<
/p>
，意思是
“
着火的药
”
。
Since the Qin and Han dynasties,
alchemy home sulfur, saltpeter and other items
make
pills
of
immortality,
from
the
accidental
explosion
of
the
phenomenon
of
inspiration,
and
then
after
repeated
practice,
and
found
the
powder
formula.
Wei
during
the
Three
Kingdoms
state-owned
smart
technician
Ma
Jun,
the
method
of
gunpowder wrapped in
paper made the entertainment of
powder
application of precedent.
自秦汉以后，炼丹家用硫黄、硝石等物炼丹，从偶然发生爆炸的现象中得到启示，再
经过多次实践，
找到了火药的配方。
三国时魏国有个聪
明的技师马钧，
用纸包火药的方法做
出了娱乐用的
“
爆仗
”
，开创了火药应用
的先河。
In the end of
theTang Dynasty, gunpowder began to be applied to
the military.
People use riprap stone
projectile machines, fire kits lit after the
projectile out, burn
the
enemy,
this
is
the
most
primitive
artillery.
Later,
people
will
head
spherical
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