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San Gabriel Wilderness
The San Gabriel Wilderness is a wilderness area created in 1968 of more than 36,118 acres (150 km2) within the Angeles National Forest and San Gabriel Mountains National Monument. The area lies on the southern slopes of the San Gabriel Mountains, between the Angeles Crest and the West Fork of the San Gabriel River. The area was originally set aside as the Devils Canyon-Bear Canyon Primitive Area of .Godfrey, Anthony ''The Ever-Changing View-A History of the National Forests in California'' USDA Forest Service Publishers, 2005 p.445 The San Gabriel Mountains were first preserved by the federal government in 1892 as the San Gabriel Timberland Reserve, established by U.S. President Benjamin Harrison and influenced by California conservationists, Abbot Kinney and John Muir. This forest reserve would later become part of the Angeles National Forest in which the San Gabriel Wilderness is now located. Recreation Permits are not required to enter the San Gabriel wilderness. Ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benjamin Harrison
Benjamin Harrison (August 20, 1833March 13, 1901) was an American lawyer and politician who served as the 23rd president of the United States from 1889 to 1893. He was a member of the Harrison family of Virginia–a grandson of the ninth president, William Henry Harrison, and a great-grandson of Benjamin Harrison V, a founding father. Harrison was born on a farm by the Ohio River and graduated from Miami University in Oxford, Ohio. After moving to Indianapolis, he established himself as a prominent local attorney, Presbyterian church leader, and politician in Indiana. During the American Civil War, he served in the Union Army as a colonel, and was confirmed by the U.S. Senate as a brevet brigadier general of volunteers in 1865. Harrison unsuccessfully ran for governor of Indiana in 1876. The Indiana General Assembly elected Harrison to a six-year term in the Senate, where he served from 1881 to 1887. A Republican, Harrison was elected to the presidency in 1888, def ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tovex
Tovex (also known as Trenchrite, Seismogel, and Seismopac) is a water-gel explosive composed of ammonium nitrate and methylammonium nitrate that has several advantages over traditional dynamite, including lower toxicity and safer manufacture, transport, and storage. It has thus almost entirely replaced dynamite. There are numerous versions ranging from shearing charges to aluminized common blasting agents. Tovex is used by 80% of international oil companies for seismic exploration. History The Tovex family of products, sometimes generically called "water gels," were developed by the Explosives Department at DuPont (E.I. du Pont de Nemours & Company, Inc.) in the mid-to-late 1960s when pelletized TNT was included in aqueous gels to create a slurry form of ANFO that displayed water-resistant properties in wet bore holes. TNT-sensitized water gels were commercially successful, but the TNT led to problems with oxygen balance: namely elevated amounts of combustion by-products such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phos-Chek
Phos-Chek is a brand of long-term fire retardants, class A foams, and gels manufactured by Perimeter Solutions, headquartered in Clayton, Missouri. Products Fire retardants Phos-Chek fire retardants are manufactured as dry powders or as concentrated liquids and diluted with water prior to use. The retardant is applied ahead of wildfires to homes and vegetation by ground crews and aerial firefighting units, either fixed-wing or rotary-wing aircraft. As of 2022, Phos-Chek LC-95A is the most used fire retardant in the world. Phos-Chek is produced in several colors, including off-white, red iron oxide, and a ''fugitive'' mixture that is red when dispersed but gradually fades to an earth-tone when exposed to sunlight. The red color aids aircrews in targeting drops of retardant. Some of the main components of Phos-Chek retardants include ammonium polyphosphate, diammonium phosphate, diammonium sulfate, monoammonium phosphate, attapulgus clay, guar gum (or a derivative of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crosscut Saw
A crosscut saw (thwart saw) is any saw designed for cutting wood perpendicular to (across) the wood grain. Crosscut saws may be small or large, with small teeth close together for fine work like woodworking or large for coarse work like log bucking, and can be a hand tool or power tool. The cutting edge of each tooth is angled in an alternating pattern. This design allows each tooth to act like a knife edge and slice through the wood in contrast to a rip saw, which tears along the grain, acting like a miniature chisel. Some crosscut saws use special teeth called "rakers" designed to clean out the cut strips of wood from the ''kerf''. Crosscut saws generally have smaller teeth than rip saws. Some saws, such as Japanese saws and those used by the ancient Egyptians, are designed to cut only on the pull stroke. Western saws, on the other hand, are designed to cut on the push stroke. Common features Many crosscut saws have a wooden handle with the return edge at right angles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chainsaws
A chainsaw (or chain saw) is a portable gasoline-, electric-, or battery-powered saw that cuts with a set of teeth attached to a rotating chain driven along a guide bar. It is used in activities such as tree felling, limbing, bucking, pruning, cutting firebreaks in wildland fire suppression, and harvesting of firewood. Chainsaws with specially designed bar-and-chain combinations have been developed as tools for use in chainsaw art and chainsaw mills. Specialized chainsaws are used for cutting concrete during construction developments. Chainsaws are sometimes used for cutting ice; for example, ice sculpture and winter swimming in Finland. History In surgery The origin of chain saws in surgery is debated. A "flexible saw", consisting of a fine serrated link chain held between two wooden handles, was pioneered in the late 18th century (c. 1783–1785) by two Scottish doctors, John Aitken and James Jeffray, for symphysiotomy and excision of diseased bone, respectively. It was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Muir
John Muir ( ; April 21, 1838December 24, 1914), also known as "John of the Mountains" and "Father of the National Parks", was an influential Scottish-American naturalist, author, environmental philosopher, botanist, zoologist, glaciologist, and early advocate for the preservation of wilderness in the United States of America. His letters, essays, and books describing his adventures in nature, especially in the Sierra Nevada, have been read by millions. His activism helped to preserve the Yosemite Valley and Sequoia National Park, and his example has served as an inspiration for the preservation of many other wilderness areas. The Sierra Club, which he co-founded, is a prominent American conservation organization. In his later life, Muir devoted most of his time to the preservation of the Western forests. As part of the campaign to make Yosemite a national park, Muir published two landmark articles on wilderness preservation in ''The Century Magazine'', "The Treasures of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abbot Kinney
Abbot Kinney (November 16, 1850 in New Brunswick, New Jersey – November 4, 1920 in Santa Monica, California) was an American developer, conservationist, water supply expert and tree expert. Kinney is best known for his " Venice of America" development in Los Angeles. Early life Kinney's family moved to Washington, D.C., and became known in politics. His aunt's husband was Senator James Dixon of Connecticut. At the age of 16, the Kinney went to Europe, where he studied in Heidelberg, Paris and Zürich and became fluent in six languages. A walking tour of Italy took him to Venice and the Italian Riviera. Returning to Washington in 1869 he joined the Maryland National Guard and in 1873 was able to join a U.S. Geological Survey team to map the Sioux reservations of the Dakotas. He traveled to Salt Lake City and Oregon and rejoined the survey team in the Yosemite Valley. In 1874, Kinney joined the tobacco business run by his older brother, Francis S. Kinney, with offices in New ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Gabriel Timberland Reserve
San Gabriel National Forest was established as the San Gabriel Forest Reserve (or San Gabriel Timberland Reserve) by the General Land Office in California on December 20, 1892 through a proclamation order by President Benjamin Harrison. With and area of (extending from Pacoima Canyon at Sylmar to Cajon Pass in Southern California), it was the first federal reserve in the state of California. After the transfer of federal forests to the U.S. Forest Service in 1905, it became a National Forest on March 4, 1907. On July 1, 1908 part of the forest was combined with Angeles National Forest and the remainder with Santa Barbara National Forest, and the name was discontinued. History The U.S. Congress passed the Forest Reserve Act in 1891 which contained an amendment, section 24, that gave the president the power to establish federal reserves of forest and rangelands from the public domain. The Yellowstone Park Timberland Reserve was the very first reserve authorized under the Fores ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Angeles County, California
Los Angeles County, officially the County of Los Angeles, and sometimes abbreviated as L.A. County, is the List of the most populous counties in the United States, most populous county in the United States and in the U.S. state of California, with 9,861,224 residents estimated as of 2022. It is the most populous non–State (United States), state-level government entity in the United States. Its population is greater than that of 40 individual List of U.S. states and territories by population, U.S. states. At and with List of cities in Los Angeles County, California, 88 incorporated cities and List of unincorporated communities in Los Angeles County, California, many unincorporated areas, it is home to more than one-quarter of California residents and is one of the most ethnically diverse counties in the United States. Its county seat, Los Angeles, is also California's most populous city and the second-most populous city in the United States, with about 3.9 million residents. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Gabriel River (California)
The San Gabriel River is a mostly urban waterway flowing southward through Los Angeles and Orange Counties, California in the United States. It is the central of three major rivers draining the Greater Los Angeles Area, the others being the Los Angeles River and Santa Ana River. The river's watershed stretches from the rugged San Gabriel Mountains to the heavily developed San Gabriel Valley and a significant part of the Los Angeles coastal plain, emptying into the Pacific Ocean between the cities of Long Beach and Seal Beach. The San Gabriel once ran across a vast alluvial flood plain, its channels shifting with winter floods and forming extensive wetlands along its perennial course, a relatively scarce source of fresh water in this arid region. The Tongva people and their ancestors have inhabited the San Gabriel River basin for thousands of years, relying on the abundant fish and game in riparian habitats. The river is named for the nearby Mission San Gabriel Arcángel, esta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
