The first recorded use of traction trebuchets was in ancient China. They were probably used by the Mohists as early as 4th century BC; descriptions can be found in the Mojing (compiled in the 4th century BC). The traction trebuchet, also referred to as a mangonel in some sources, is…
A greedy person is someone whose primary goal in life is to get more and more of something they want, and their whole focus is on getting it. We usually think of money when we think of greed, but a person can be greedy for other things also-food, fame, possessions,…
In 1902 she became the first person who is deafblind to write a book. Her autobiography, The Story of My Life, was the first of 14 books she wrote in her lifetime. In 1918, teachers in the United States adopted braille as the official writing system for people who are…
(I) Follower of Hinduism: The Hindu law applies to the person who is a follower of the Hindu religion. This includes the followers of Virashaiva, Lingayat, Brahmo, Prarthana or Arya Samaj. Apart from these it also applies to the persons who are the followers of Buddhism, Jainism or Sikhism. In…
One of Judson’s goals in inventing this device was to eliminate the tediousness that came with fastening boots which at that time, utilized a series of buttons to enclose the wearer’s foot. Zipper Judson’s most noteworthy invention, a chain-lock fastener, was the precursor to the modern zipper which he developed…
Mandatory reporters are required to report the facts and circumstances that led them to suspect that a child has been abused or neglected. They do not have the burden of providing proof that abuse or neglect has occurred. Permissive reporters follow the same standards when electing to make a report.…
Instead of damming water on one side like a conventional dam, a tidal barrage allows water to flow into a bay or river during high tide, and releases the water during low tide. This is done by measuring the tidal flow and controlling the sluice gates at key times of…
Elijah McCoy, one of the most influential inventors of the 19th century, invented the first ironing board and lawn sprinkler system. Who invented the ironing board? Improved Ironing Board, Invented by Sarah Boone in 1892 The ironing board is a product that’s used possibly just as much as it’s overlooked.…
The origins of modern trade unions can be traced back to 18th-century Britain, where the rapid expansion of industrial society then taking place drew masses of people, including women, children, peasants and immigrants into cities. Trade unions were legalised in 1824, when growing numbers of factory workers joined these associations…
This invention was the work of Joseph Lessler of Buffalo, New York, who in 1871 filed U.S. patent number 121949. Called an “Improvement in Lawn-sprinklers” and described as “a portable water fountain and sprinkler,” other patents and designs soon followed. A History of Lawn Sprinklers. In 1932, a Californian fruit…