A printing press is a mechanical device for applying pressure to an inked surface resting upon a print medium (such as paper or cloth), thereby transferring the ink. In Germany, around 1440, goldsmith Johannes Gutenberg invented the printing press, which started the Printing Revolution. However with development of the technology we can find printers with developed features.
Within the timeline of radio, many people contributed theory and inventions in what became radio. As a result in 1894 the Italian inventor Guglielmo Marconi invented the first radio. It is the first engineering complete, commercially successful wireless telegraphy system based on radio transmission. He demonstrated the application of radio in military and marine communications.
Antibiotics are medicines that fight bacterial infections in people and animals. They work by killing the bacteria or by making it hard for the bacteria to grow and multiply. Penicillins are a group of antibacterial drugs that attack a wide range of bacteria. They were the first drugs of this type that doctors used. In […]
Telephone converts sound, typically and most efficiently the human voice, into electronic signals. They are transmitted via cables to another telephone. Alexander Graham Bell invented the telephone in 1876. He was a teacher for the deaf at Boston University. In researching ways to teach the deaf, he experimented with transmitting sound via electricity. As a result he […]
The light we use today in our homes and offices comes more than 150 years ago. Throughout the nineteenth century, inventors produced simple electric lights. For example, Joseph Swan produced a simple electric light. But, he struggled to maintain a power source and the filament soon burned out when the vacuum was exhausted. Thomas A. […]
රියැදුරු අසුන අසල සිටම එක සමාන බරක් පැටවුවහොත් කඳු, පල්ලම් වලදි එම බර ඉදිරියට දැනෙයි. එබැවින් පසුපසට වන්නට වැඩි බරක් රඳවනු ලැබේ. එවිට කන්ද ඇදීමේදී යම් අපහසුතාවක් දැනුනද පල්ලම බැසීමේදී ඉදිරිපසට ඇතිවන අවදානම අවම කරගත හැකිය.
On December 17, 1903, Wilbur and Orville Wright (Wright brothers) piloted the first powered, sustained, and controlled flight. Within a few years, airplanes were successfully navigating long distances and soon began to transform both wartime and global travel. Most airplanes are flown by a pilot on board the aircraft. But some are designed to be […]
The Internet is a networking infrastructure. Whereas the World Wide Web is a way to access information over the medium of the Internet. Sir Tim Berners Lee a British Computer Scientist, is considered the father and the founder of World Wide Web. In 1991, Berners-Lee announced the WWW software on Internet newsgroups, and interest in the project […]
The iPhone is a line of smartphones designed and marketed by Apple Inc. It’s mobile operating system is known as iOS . On January 9, 2007, Apple Inc. CEO Steve Jobs exposed the iPhone at the Macworld convention in San Francisco. The iPhone has generated large profits for Apple, making it one of the world’s most valuable […]
ජීවීන්ට ක්‍රියාත්මක වීමට වායුගෝලයක් අවශ්‍යයයි. සඳ මතුපිට ජලය නොමැති අතර පැවැත්මට අවශ්‍ය අත්‍යවශ්‍ය සාධක ද නොමැත. එබැවින් ජීවීන් පැවතීමට අවස්ථාවක් නැත. එය දැනට ඇති මතයක් විතරයි. එයට හේතුව විවිධ පරිසරයන්ට අනුවර්තනය වී ඇති ශ්වසනය නොකරන ජීවීන් සිටිය හැක.
