Cameras record images. Images that we see with our eyes are fleeting – one moment they are 
there, the next moment they are gone. These same images can be recorded and stored with cameras. But how is this done? A still film camera is made of three basic parts – an optical element which is the lens, a chemical element or the film, and a mechanical element that is the body of the camera itself. Photography is adjusting and combining these elements in such a way that they record a crisp, recognizable image.Most of the inside of a camera is an empty space. The empty space is dark, because it is sealed off from the light outside. Light can only get in when a little door at the front of the Camera, known as the shutter, is opened for a very short time.The light passes through a lens which is a type of glass. The lens bends the light and ends up marking an image on the film at the back of the camera. When the light hits the film, the chemicals on the film change to capture the image. The film is then taken out of the camera and treated with other chemicals to make the image visible and permanent.
Storm warning signals are symbols and flags that give us information about sudden, violent and strong wind which is approaching, or a storm that has already formed. Other symbols caution us that a port is threatened by a storm, and of danger from hurricanes and cyclones. Storm warning signals also show the direction that a storm is taking, so that boats and ships can avoid these areas. For people living in coastal areas, for fisherman and pilots, paying attention to storm warnings can save many lives. Storm warnings also play an important part in commerce, navigation and in farming
Deaf and dumb people many not be able to hear or speak, but that does not mean that they cannot communicate with others. Instead of talking as we do, they talk with their fingers and hands. We can also say that they communicate through a visual language. There are two kinds of deaf and dumb sign language. One method uses one hand, the other uses both hands. Different finger positions stand for different letters of the alphabet, and words are spelt out one letter at a time.Signs used by the deaf and dumb also represent ideas. Many signs use a visual image to convey an idea. For example, mimicking a pair of horns means a deer, or a trunk means an elephant.Sometimes, deaf and dumb people use facial expressions and other gestures in order to communicate faster. Nowadays, there are many techniques that teach deaf people to speak like we do. They also learn to read lips so that they can understand.
added decorations by hand.The Diamond Sutra, which is a Buddhist prayer on a scroll, made in China, is thought to be the oldest complete printed book. It was printed with woodblocks, and looks very much like a Chinese manuscript scroll. The world’s first printed Bible is the Gutenberg Bible, which has 42 lines of text on a page. Gutenberg wanted his printed Bible to look just like a manuscript Bible, and modelled his type on German script. The decorations around the margins and the headings at the top of the page were done by hand after the book was printed and before it was bound.
also wear a badge when he goes to work. A badge is something that you wear to show who you are, to which institution you belong, or what your rank is. It may also be reward for something you have achieved, or a sign of your authority.Badges are of great importance in the military. Everyone wears one to show his or her rank, and also signify any special training received and record note worthy achievements. Policeman wears badges to show their authority, and members of a club may wear a badge to show that they belong to a particular club or group. Sometimes badges are worn as a sign of protest, and sometimes as sign of mourning, like the black badges worn when someone dies Badges can be made of many different types of materials… cloths, metal, plastic, rubber or leather. Some badges are quite beautiful and collecting badges can be an enjoyable hobby. 
always given respect. Flags are important in the military where they are used to coordinate actions of different units and avoid confusion. A ship at sea flies a flag to identify itself, and the navy uses flags extensively for signaling Originally, flags were used primarily in warfare. To some extent, they remain a symbol of leadership, serving for identification of friend and foe, and as rallying points. Flags are now also extensively used for signaling, for decoration, and for display. A person who is chosen to carry a flag during any ceremony is called a flag bearer. It is a great honour to be selected as a flag bearer, whether it is your school flag, or the national flag.
Flags have long been used to identify a ship’s nationality and to convey clear messages. Flags of different patterns and colours form an internationally recognized code for the letters of the alphabet and each also has a meaning of its own when flown individually. They are shown below.[custom_search_and_filter]