HISTORY OF CUTTING TOOL MATERIALS • Cutting tool used during the industrial revolution in 1800 A.D • First cutting tool was cast using crucible method (1740) and slight hardened by H.T. • 1868: R. Mushet found by adding Tungsten we can increase hardness and tool life ( Air Quenching) • F.W.Taylor in Pennsylvania did the most basic research in metal cutting between 1880-1905 • Invented high speed steel (better H.T. process) • Better alloy
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Steps Towards an Ecosociety: Dealing with Air Pollution By: Jonathan Roitman For: Dr. Rao Course: Poli 385/2 This essay identifies and explains the problem of pollution facing humanity today. It will also propose one of the first ideas which could more effectively limit air pollution‚ Emission Credit Trading. This can be seen as one of the first steps in the development of an ecosociety. The notion of a viable ecosociety has created considerable problems in terms
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controlling noise pollution‚ taking in carbon dioxide but give out oxygen‚ cleaning the air‚ providing shade and coolness‚ act as our natural air conditioner can be considered as the first few reasons why trees are priceless. Trees also help-save energy‚ improve air quality‚ and solves health problems. They also have financial benefits - a variety of studies show that trees increase residential property values. People pay more for homes with attractive and fully- grown trees or that are in neighborhoods
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Industrial pollution is responsible for 45% of the overall pollution in the Pasig River. Approximately 315 of the 2‚000 or more factories that is located in the river basin are identified as the main polluters of the river‚ discharging an average of 145 tons of biochemical oxygen demand (BOD) per day. This was recognized by defining the suspended solids in their treated and untreated waste-waters. It is said that‚ the textile and food manufacturing industries are the utmost water polluters. The pollution
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Millions of years before animals lived on land; there were trees on the Earth. But today trees are in serious danger. Everybody knows that trees produce oxygen that we breathe and take carbon dioxide that we exhale that is why trees called the lungs of our world. As man cannot live without lungs‚ so and world cannot exist without trees. Factories‚ power stations and cars emit tons of smoke into the air. This smoke contains sulphur dioxide and nitrogen oxide. These substances mix with water vapor
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advancement‚ life has become much easier‚ however‚ not without its share of negative consequences. One such consequence is that the quality of the air we breathe has deteriorated considerably- mainly as a result of human activity. Is this an acceptable price to pay for development? INTRODUCTION: This report seeks to identify the main industrial sources of air pollution in Trinidad and Tobago‚ describe the nature of the pollutants released by these sources and the likely impact that they will have on the
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I. Lubricants selection and Application A.Viscosity Most important property of any lubricant is viscosity. A common mistake when selecting a grease is to confuse the grease consistency with the base oil viscosity. Because the majority of grease-lubricated applications are element bearings‚ one should consider viscosity selection for those applications. While most would not use an EP 220 gear oil for an oil-lubricated electric motor bearing‚ many people will use a grease containing that same oil
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Trees occupy an important place in the life of man. The trees provide us flowers‚ fruits‚ fodder for animals‚ wood for fire and furniture and provide cool shadow from scorching sun. They give us so many such good things and yet expect nothing in return. Trees give us fruits for food and flowers for pleasure. They provide us timber (wood) for building our houses and making furniture. They provide us wood for fuel. They supply sleepers for the railway line. Many trees provide us medicinal products
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to reduce air pollution? Air pollution is the addition of any harmful substances (dust particles‚ fumes or odour) to the atmosphere‚ which causes the damaging of the environment‚ humans‚ animals and plant. Air pollution can result from both human and natural actions. Natural events that pollute the air include wind erosion‚ volcanic eruptions‚ forest fires‚ and natural radioactivity. Pollution from natural occurrences are not very often. Human activities that result in air pollution include the
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usable as lumber‚ only plants above a specified height or only perennial species. At its broadest‚ trees include the taller palms‚ the tree ferns‚ bananas and bamboo. A tree typically has many secondary branches supported clear of the ground by the trunk. This trunk typically contains woody tissue for strength‚ and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier. Below the ground‚ the
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