|
Blue Light (pyrotechnic Signal)
Blue light is an archaic signal, the progenitor of modern pyrotechnic flares. Blue light consists of a loose, chemical composition burned in an open, hand-held hemispherical wooden cup, and so is more akin to the flashpan signals of the Admiral Nelson era than the modern, encased signal flares, which are often launched by mortar or rifle and suspended by parachute. Widely used during the eighteenth and nineteenth centuries for signaling by the world's military forces, and for general illumination in the civilian sector, blue light was remarkable for its use of poisonous arsenic compounds ( realgar and orpiment), which contributed to its replacement by safer flares in the early twentieth century. Confusion with blue-colored lanterns Blue light was famously mentioned in accounts of the ''H.L. Hunley'', the Confederate submarine which became the first to sink an enemy vessel, the , on February 17, 1864, during the Civil War. Such blue light has been repeatedly misidentified by au ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Light
Blue Light or Blue light may refer to: Science and technology * Portion of the visible spectrum related to the blue color ** Blue laser ** Blue LED * Cherenkov radiation, the physical phenomenon responsible for the characteristic blue glow in nuclear reactors * Blue light (pyrotechnic signal), a firework composition used for night-time signaling and illumination * Biological effects of high-energy visible light Military and emergency services * Blue Light (counter-terrorist subunit), a 1970s US counter-terrorist subunit of the 5th Special Forces Group * Blue lights, also known as blues and twos services, British emergency services * Blue lights, emergency telephone systems meant to deter crime, specially designed for use on campuses Arts, entertainment and media Film and television * ''The Blue Light'' (1932 film), a 1932 film directed by Leni Riefenstahl * ''The Blue Light'' (2003 film), a 2003 Japanese film directed by Yukio Ninagawa * ''Blue Light'' (TV series), a 1966 t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warren Lasch Conservation Center
The Warren Lasch Conservation Center is a building located at 1250 Supply Street at the former Charleston Navy Yard, in North Charleston, South Carolina. Part of the Clemson Restoration Institute, the center is most notably being used to excavate, examine, and preserve the submarine ''H. L. Hunley ''H. L. Hunley'', often referred to as ''Hunley'', '' CSS H. L. Hunley'', or as ''CSS Hunley'', was a submarine of the Confederate States of America that played a small part in the American Civil War. ''Hunley'' demonstrated the advantages and th ...''. In recent years, the center has expanded research into various metal and architectural conservation topics. The namesake of the building is Warren F. Lasch, who was chairman of Friends of the Hunley during the ''Hunley'''s recovery. The ''Hunley'' is housed in a specially-designed tank of fresh water to await conservation. External links Friends of the Hunley [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emergency Communication
An emergency is an urgent, unexpected, and usually dangerous situation that poses an immediate risk to health, life, property, or environment and requires immediate action. Most emergencies require urgent intervention to prevent a worsening of the situation, although in some situations, mitigation may not be possible and agencies may only be able to offer palliative care for the aftermath. While some emergencies are self-evident (such as a natural disaster that threatens many lives), many smaller incidents require that an observer (or affected party) decide whether it qualifies as an emergency. The precise definition of an emergency, the agencies involved and the procedures used, vary by jurisdiction, and this is usually set by the government, whose agencies ( emergency services) are responsible for emergency planning and management. Defining an emergency An incident, to be an emergency, conforms to one or more of the following, if it: * Poses an immediate threat to life, h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighting
Lighting or illumination is the deliberate use of light to achieve practical or aesthetic effects. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings. This can save energy in place of using artificial lighting, which represents a major component of energy consumption in buildings. Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants. Indoor lighting is usually accomplished using light fixtures, and is a key part of interior design. Lighting can also be an intrinsic component of landscape projects. History With the discovery of fire, the earliest form of artificial lighting used to illuminate an area were campfires or torches. As early as 400,000 years ago, fire was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stonewall Jackson's Way
"Stonewall Jackson's Way" is a poem penned during the American Civil War that later became a well-known patriotic song of the Confederate States and the Southern United States. It became very popular, but its authorship was unknown until almost 25 years later. The poem honors the famed Confederate Army officer Lieutenant General Thomas J. "Stonewall" Jackson, and was written by John Williamson Palmer (1825–1906), who stated that he had written the ballad on September 16, 1862; however, Miller & Beacham, who published the song in 1862, stated that the song was found on the body of a Confederate sergeant after the First Battle of Winchester, May 25, 1862. It is possible this alternative origin story was concocted to prevent Palmer, a Northerner, from being arrested as a Confederate sympathizer. The Ballad Index ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shelby Foote, The Civil War
Shelby may refer to: Places United States * Shelby, Alabama, a census-designated place and unincorporated community * Shelby, Idaho * Shelby, Indiana, an unincorporated town * Shelby, Iowa, a city * Shelby, Oceana County, Michigan, a village * Shelby, Mississippi, a city * Shelby, Missouri, an unincorporated community * Shelby, Montana, a city * Shelby, Nebraska, a village * Shelby, New York, a town * Shelby, North Carolina, a small city * Shelby, Ohio, a city * Shelby, Texas, an unincorporated town * Shelby, Virginia * Shelby, Wisconsin, a town ** Shelby (community), Wisconsin, an unincorporated community * Camp Shelby, a military post adjacent to Hattiesburg, Mississippi * Fort Shelby (Michigan), a military fort in Detroit, in use from 1779 to 1826 * Fort Shelby (Wisconsin), an American military installation built in 1814 and destroyed by the British in 1815 * Shelby County (other) * Shelby Township (other) Elsewhere * Mount Shelby, a mountain in Anta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stonewall Jackson
Thomas Jonathan "Stonewall" Jackson (January 21, 1824 – May 10, 1863) was a Confederate general during the American Civil War, considered one of the best-known Confederate commanders, after Robert E. Lee. He played a prominent role in nearly all military engagements in the Eastern Theater of the war until his death, and had a key part in winning many significant battles. Military historians regard him as one of the most gifted tactical commanders in U.S. history. Born in what was then part of Virginia (now in West Virginia), Jackson received an appointment to the United States Military Academy at West Point and graduated in the class of 1846. He served in the U.S. Army during the Mexican–American War of 1846–1848 and distinguished himself at Chapultepec. From 1851 to 1861, he taught at the Virginia Military Institute, where he was unpopular with his students. When Virginia seceded from the Union in May 1861 after the attack on Fort Sumter, Jackson joined the Confe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christianity
Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other names and titles), was a first-century Jewish preacher and religious .... It is the Major religious groups, world's largest and most widespread religion with roughly 2.38 billion followers representing one-third of the global population. Its adherents, known as Christians, are estimated to make up a majority of the population in Christianity by country, 157 countries and territories, and believe that Jesus in Christianity, Jesus is the Son of God (Christianity), Son of God, whose coming as the Messiah#Christianity, messiah was Old Testament messianic prophecies quoted in the New Testament, prophesied in the Hebrew Bible (called the Old Testament in Christianity) and chronicled in the New Testamen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Of Wales
Prince of Wales ( cy, Tywysog Cymru, ; la, Princeps Cambriae/Walliae) is a title traditionally given to the heir apparent to the English and later British throne. Prior to the conquest by Edward I in the 13th century, it was used by the rulers of independent Wales. The first native Welsh prince was Gruffudd ap Cynan of Gwynedd, in 1137, although his son Owain Gwynedd (Owain ap Gruffudd) is often cited as having established the title. Llywelyn the Great is typically regarded as the strongest leader, holding power over the vast majority of Wales for 45 years. One of the last independent princes was Llywelyn ap Gruffydd (Llywelyn the Last), who was killed at the Battle of Orewin Bridge in 1282. His brother, Dafydd ap Gruffydd, was executed the following year. After these two deaths, Edward I of England invested his son Edward of Caernarfon as the first English prince of Wales in 1301. The title was later claimed by the heir of Gwynedd, Owain Glyndŵr (Owain ap Gruffydd), f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Plate, North American Tectonic Plate, Greenland is included as a part of North America geographically. North America covers an area of about , about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the list of continents and continental subregions by population, fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in List of sovereign states and dependent territories in North America, 23 independent states, or about 7.5% of the world's population. In Americas (terminology)#Human ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niagara Falls
Niagara Falls () is a group of three waterfalls at the southern end of Niagara Gorge, spanning the border between the province of Ontario in Canada and the state of New York in the United States. The largest of the three is Horseshoe Falls, which straddles the international border of the two countries. It is also known as the Canadian Falls. The smaller American Falls and Bridal Veil Falls lie within the United States. Bridal Veil Falls is separated from Horseshoe Falls by Goat Island and from American Falls by Luna Island, with both islands situated in New York. Formed by the Niagara River, which drains Lake Erie into Lake Ontario, the combined falls have the highest flow rate of any waterfall in North America that has a vertical drop of more than . During peak daytime tourist hours, more than of water goes over the crest of the falls every minute. Horseshoe Falls is the most powerful waterfall in North America, as measured by flow rate. Niagara Falls is famed for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fireworks
Fireworks are a class of low explosive pyrotechnic devices used for aesthetic and entertainment purposes. They are most commonly used in fireworks displays (also called a fireworks show or pyrotechnics), combining a large number of devices in an outdoor setting. Such displays are the focal point of many cultural and religious celebrations. Fireworks take many forms to produce four primary effects: noise, light, smoke, and floating materials ( confetti most notably). They may be designed to burn with colored flames and sparks including red, orange, yellow, green, blue, purple and silver. They are generally classified by where they perform, either 'ground' or 'aerial'. Aerial fireworks may have their own propulsion ( skyrocket) or be shot into the air by a mortar ( aerial shell). Most fireworks consist of a paper or pasteboard tube or casing filled with the combustible material, often pyrotechnic stars. A number of these tubes or cases may be combined so as to make wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> North America")
