Free Essays on Communications Technology

Communication/ Media Technology This essay will be based on the life and works of some of the more noted innovators in the field of communication and media technology and will include a discussion around how technological advancement may have a detrimental effect on the lives of individuals and society as a whole. Early Methods  ¡Ã‚ ¥Communication ¡Ã‚ ¦ is the act of transmitting and receiving ideas, messages and information. When considering communication between two people it could be described as a by-product or outgrowth of various different methods of self expression that have developed over thousands of years: Gestures accompanied by sounds could have been the beginnings of language. Smoke signals as used by Native Americans, cave paintings and engravings from the Palaeolithic period dating as far back as 10,000  ¡V 40,000 BC are all forms of expression and are efforts to communicate thoughts and ideas. Long before the telephone was developed and became universally available and before the invention of the electric telegraph, communicating over any significant distance would undoubtedly have been protracted and frustrating with letter mail being among the most popular and relied upon method of communication. Semaphore It seems that  ¡Ã‚ ¥fast ¡Ã‚ ¦ long distance technology began during the French revolution, in the late eighteenth century, when French merchant Claude Chappe used a semaphore telegraph to send messages between the French army at Lille and Paris. This was achieved by using a relay system and by changing the position of the arms which were set upon a mast or tower. A message could be sent considerable distances and it was possible to send a semaphore telegraph the 240 kilometres from Lille to Paris in two minutes. Semaphore telegraphs continued to be popular until the early 19th century, until the electric telegraph was invented. Telegraph The electric telegraph was pioneered... Free Essays on Communications Technology Free Essays on Communications Technology Communication/ Media Technology This essay will be based on the life and works of some of the more noted innovators in the field of communication and media technology and will include a discussion around how technological advancement may have a detrimental effect on the lives of individuals and society as a whole. Early Methods  ¡Ã‚ ¥Communication ¡Ã‚ ¦ is the act of transmitting and receiving ideas, messages and information. When considering communication between two people it could be described as a by-product or outgrowth of various different methods of self expression that have developed over thousands of years: Gestures accompanied by sounds could have been the beginnings of language. Smoke signals as used by Native Americans, cave paintings and engravings from the Palaeolithic period dating as far back as 10,000  ¡V 40,000 BC are all forms of expression and are efforts to communicate thoughts and ideas. Long before the telephone was developed and became universally available and before the invention of the electric telegraph, communicating over any significant distance would undoubtedly have been protracted and frustrating with letter mail being among the most popular and relied upon method of communication. Semaphore It seems that  ¡Ã‚ ¥fast ¡Ã‚ ¦ long distance technology began during the French revolution, in the late eighteenth century, when French merchant Claude Chappe used a semaphore telegraph to send messages between the French army at Lille and Paris. This was achieved by using a relay system and by changing the position of the arms which were set upon a mast or tower. A message could be sent considerable distances and it was possible to send a semaphore telegraph the 240 kilometres from Lille to Paris in two minutes. Semaphore telegraphs continued to be popular until the early 19th century, until the electric telegraph was invented. Telegraph The electric telegraph was pioneered...

How to Tell a Male From a Female Shark

How to Tell a Male From a Female Shark Ever wondered how to tell the sex of a shark? Distinguishing the sex of a shark is easier than in most marine species. Its all in the sharks external anatomy. Male sharks have modified pelvic fins called claspers. Females do not have these claspers. As male sharks age, the calcium is deposited in the claspers, so that older males have harder claspers. In addition to the absence of claspers, females tend to be larger than males, although those differences may not always be obvious, especially in the wild. Where Claspers Are Located These claspers are located on the sharks underside, within the sharks two pelvic fins. They look kind of like long fingers that extend underneath the sharks belly.   Shark Reproduction in Brief The claspers are used for reproduction. Sharks breed via sexual reproduction with internal fertilization. This involves the sharks usually positioning themselves belly to belly, a process that can involve a lot of biting. The claspers have grooves which are used to transfer sperm from the male shark to the females cloaca.  The sperm is moved through the grooves using seawater. The sperm fertilizes the females eggs, and voila!- a shark embryo is created. From there, development and birth vary by species.   In some species, such as bamboo sharks, the female lays eggs outside of her body (oviparous). About 40% of the 400 shark species lay eggs. In ovoviviparous  sharks, such as whale sharks, basking sharks, and thresher sharks, the eggs develop inside the females body, but the young are born live. Placental viviparous sharks give birth in a way similar to mammals- the young shark is nourished inside the female by a yolk-sac placenta, before being born live. Bull sharks, lemon sharks, and hammerhead sharks are examples of species that employ this strategy.