Elijah McCoy :: essays research papers

Elijah McCoy was born in Colchester, Ontario Canada on May 2, 1844, the son of former slaves who had fled from Kentucky before the U.S. Civil War. Educated in Scotland as a mechanical engineer, Elijah McCoy returned to the United States and settled in Detroit, Michigan. He began experimenting with a cup that would regulate the flow of oil onto moving parts of industrial machines. His first invention was a lubricator for steam engines, U.S. 129,843, which issued on July 12, 1872. The invention allowed machines to remain in motion to be oiled; his new oiling device revolutionized the industrial machine industry. Elijah McCoy established his own firm and was responsible for a total of 57 patents, the term â€Å"real McCoy† refers to the oiling device used for industrial machinery. His contribution to the lubricating device became so popular that people inspecting new equipment would ask if the device contained the real McCoy, This helped popularize the American expression, meaning the real thing. His other inventions included an ironing board and lawn sprinkler. Elijah McCoy died on October 10, 1929 after a year in the Eloise Infirmary, Eloise, Michigan, suffering from senile dementia caused by hypertension. He was buried in Detroit, Michigan. Elijah McCoy was born in Colchester, Ontario Canada on May 2, 1844, the son of former slaves who had fled from Kentucky before the U.S. Civil War. Educated in Scotland as a mechanical engineer, Elijah McCoy returned to the United States and settled in Detroit, Michigan. He began experimenting with a cup that would regulate the flow of oil onto moving parts of industrial machines. His first invention was a lubricator for steam engines, U.S. 129,843, which issued on July 12, 1872. The invention allowed machines to remain in motion to be oiled; his new oiling device revolutionized the industrial machine industry. Elijah McCoy established his own firm and was responsible for a total of 57 patents, the term â€Å"real McCoy† refers to the oiling device used for industrial machinery.

Discussing the architecture of Michelangelo

Mannerism refers to a time of European art that began around 1520 in Italy, and lasted until around 1580 to 1600, when the Baroque style of art and architecture began to replace it, but it did continue in many forms until the 17th century. The characteristics of Mannerism include artificial qualities that go against the harmonious, natural elements of High Renaissance art, and a great deal of sophistication, complexity and innovation in design.Michelangelo was one of the greatest practitioners of Mannerism for several reasons. Elegance and innovation are two of the primary elements of Mannerism, and Michelangelo certainly practiced both those elements in his art. Some of his greatest architectural and artistic endeavors contain these elements, combined with sophistication in the design and execution of the works such as the Sistine Chapel's ceiling. The paintings on the ceilings have stood the test of time, and retain their beauty, complexity and eloquence even today.In addition, the concept of painting on the ceiling of a wondrous piece of architecture was also one of Michelangelo's innovations, illustrating how he actively participated in the Mannerism movement. In architecture, Michelangelo also excelled as a Mannerist. â€Å"Mannerist architects were no less interested in ancient classical architecture than were their predecessors, but they found other qualities in ancient Roman architecture to exploit. In fact, they often displayed an even greater knowledge of antiquity than did earlier artists† (Italian Mannerism or Late Renaissnce, 2009).Michelangelo's greatest architectural achievements, such as the Laurentian Library in Florence, helped indicate he was a Mannerist by its' obvious breaking of many architectural rules of the time, showing not only its elegance, but its novelty and sophistication, as well. Michelangelo uses classic design in his building, but adds a new way of assembling them throughout the design in novel and unusual motifs. In th e Palazzo Farnese in Rome, Michelangelo used unnatural and manufactured views throughout the building, another trademark of Mannerist buildings. Many architects view Michelangelo as one of the geniuses of the movement.His, â€Å"Medici Chapel in San Lorenzo was executed, in Vasari's opinion, ‘in a style more varied and novel than that of any other master,' and ‘thus all artists are under a great and eternal obligation to Michelangelo, seeing that he broke the fetters and chains that had earlier confined them to the creation of traditional forms† (Italian Mannerism or Late Renaissnce, 2009). Michelangelo knew how to push the envelope in design and execution, and was interested in change, rather than copying other styles, which are also elements of the Mannerist style of architecture.His greatest Mannerist achievement is St. Peter's Basilica in Rome, a massive project that took him over 18 years to design, and was not completed before his death. This beautiful build ing was dominated by a huge dome that would have been incredible had it been completed during Michelangelo's life. Later changes to the building altered the dome and its effect on the overall building design, but it was one of his greatest achievements, and the innovation and spectacular dimensions of the design helped cement Michelangelo as one of the premier Mannerist architects and artists of the day.Mannerism eventually fell out of favor in Europe, and was replaced by other forms of architecture, including the intricate and detailed Baroque, which followed Mannerism. It was one of the greatest epics of Italian architecture and design, led by one of the greatest artists of all time, Michelangelo. Works Cited Italian Mannerism or Late Renaissnce. (2009, January 16). Retrieved from Italian Mannerism: http://www. cartage. org. lb/en/themes/arts/Architec/MannerismArchitecture/ItalianMannerism/ItalianMannerism. htm Janson's History of Art. (2007). Upper Saddle River: Pearson Education , Inc.

What Is Disruptive Selection

Disruptive selection is a type of natural selection that selects against the average individual in a population. The makeup of this type of population would show phenotypes (individuals with groups of traits) of both extremes but have very few individuals in the middle. Disruptive selection is the rarest of the three types of natural selection and can lead to the deviation in a species line. Basically, it comes down to the individuals in the group who get to mate—who survive best. They are the ones who have traits on the extreme ends of the spectrum. The individual with just middle-of-the-road characteristics is not as successful at survival and/or breeding to further pass on average genes. In contrast, population functions in stabilizing selection mode when the intermediate individuals are the most populous. Disruptive selection occurs in times of change, such as habitat change or change in resources availability. Disruptive Selection and Speciation The bell curve is not typical in shape when exhibiting disruptive selection. In fact, it looks almost like two separate bell curves. There are peaks at both extremes and a very deep valley in the middle, where the average individuals are represented. Disruptive selection can lead to speciation, with two or more different species forming and the middle-of-the-road individuals being wiped out. Because of this, its also called diversifying selection, and it drives evolution. Disruptive selection happens in large populations with lots of pressure for the individuals to find advantages or niches as they compete with each other for food to survive and/or partners to pass on their lineage. Like directional selection, disruptive selection can be influenced by human interaction. Environmental pollution can drive disruptive selection to choose different colorings in animals for survival. Disruptive Selection Examples: Color Color, in regards to camouflage, serves as a useful example in many different kinds of species, because those individuals that can hide from predators the most effectively will live the longest. If an environment has extremes, those who dont blend into either will be eaten the most quickly, whether theyre moths, oysters, toads, birds or another animal. Peppered moths: One of the most studied examples of disruptive selection is the case of ​Londons peppered moths. In rural areas, the peppered moths were almost all a very light color. However, these same moths were very dark in color in industrial areas. Very few medium-colored moths were seen in either location. The darker-colored moths survived predators in the industrial areas by blending in with the polluted surroundings. The lighter moths were seen easily by predators in industrial areas and were eaten. The opposite happened in rural areas. The medium-colored moths were easily seen in both locations and were therefore very few of them left after disruptive selection.​​ Oysters: Light- and dark-colored oysters could also have a camouflage advantage as opposed to their medium-colored relatives. Light-colored oysters would blend into the rocks in the shallows, and the darkest would blend better into the shadows. The ones in the intermediate range would show up against either backdrop, offering those oysters no advantage and make them easier prey. Thus, with fewer of the medium individuals surviving to reproduce, the population eventually has more oysters colored to either extreme of the spectrum. Disruptive Selection Examples: Feeding Ability Evolution and speciation isnt all a straight line. Often there are multiple pressures on a group of individuals, or a drought pressure, for example, that is just temporary, so the intermediate individuals dont completely disappear or dont disappear right away. Timeframes in evolution are long. All types of diverging species can coexist if there are enough resources for them all. Specialization in food sources among a population might occur in fits and starts, only when there is some pressure on supply. Mexican spadefoot toad tadpoles: Spadefoot tadpoles have higher populations in the extremes of their shape, with each type having a more dominant eating pattern. The more omnivorous individuals are round-bodied, and the more carnivorous are narrow-bodied. The intermediate types are smaller (less well-fed) than those at either extreme of body shape and eating habit. A study found that those at the extremes had additional, alternate food resources that the intermediates didnt. The more omnivorous ones fed more effectively on pond detritus, and the more carnivorous ones were better at feeding on shrimps. Intermediate types competed with each other for food, resulting in individuals with ability on the extremes to eat more and grow faster and better. Darwins finches on the Galapagos: Fifteen different species developed from a common ancestor, which existed 2 million years ago. They differ in beak style, body size, feeding behavior, and song. Multiple types of beaks have adapted to different food resources, over time. In the case of three species on Santa Cruz Island, ground finches eat more seeds and some arthropods, tree finches eat more fruits and arthropods, vegetarian finches feed on leaves and fruit, and warblers typically eat more arthropods. When food is abundant, what they eat overlaps. When its not, this specialization, the ability to eat a certain type of food better than other species, helps them survive.