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This field pertains to the efficient use of machinery, labor, and raw materials in industrial production. It is particularly important from the viewpoint of costs and economics of production, safety of human operators, and the most advantageous deployment of automatic machinery. Engineers in this field design, test, build, and operate machinery of all types; they also work on a variety of manufactured goods and certain kinds of structures. The field is divided into (1) machinery, mechanisms, materials, hydraulics, and pneumatics; and (2) heat as applied to engines, work and energy, heating, ventilating, and air conditioning. The mechanical engineer, therefore, must be trained in mechanics, hydraulics, and thermodynamics and must be fully grounded in such subjects as metallurgy and machine design. Some mechanical engineers specialize in particular types of machines such as pumps or steam turbines. A mechanical engineer designs not only the machines that make products but the products themselves, and must design for both economy and efficiency. A typical example of the complexity of modern mechanical engineering is the design of an automobile, which entails not only the design of the engine that drives the car but also all its attendant accessories such as the steering and braking systems, the lighting system, the gearing by which the engine's power is delivered to the wheels, the controls, and the body, including such details as the door latches and the type of seat upholstery. This branch is concerned with the application of the engineering sciences to military purposes. It is generally divided into permanent land defense ( Fortification and Siege Warfare) and field engineering. In war, army engineer battalions have been used to construct ports, harbors, depots, and airfields. In the U.S., military engineers also construct some public works, national monuments, and dams ( Army Corps of Engineers). Military engineering has become an increasingly specialized science, resulting in separate engineering subdisciplines such as ordnance, which applies mechanical engineering to the development of guns and chemical engineering to the development of propellants, and the Signal Corps, which applies electrical engineering to all problems of telegraph, telephone, radio, and other communication. Engineers who have the overall responsibility for designing and supervising construction of ships are called naval architects. The ships they design range in size from ocean-going supertankers as much as 1300 feet long to small tugboats that operate in rivers and bays. Regardless of size, ships must be designed and built so that they are safe, stable, strong, and fast enough to perform the type of work intended for them. To accomplish this, a naval architect must be familiar with the variety of techniques of modern shipbuilding, and must have a thorough grounding in applied sciences, such as fluid mechanics, that bear directly on how ships move through water. Roper Electronic Engineering Ltd have specialised in the design, manufacture and repair of Automatic Voltage Regulators for the last 15 years. Our main business is the manufacture of replacement AVR's for obsolete unit's and those for special applications. In addition to our own range, we also stock a number of other manufacturers models in common use, including those from Newage/Markon, Contrology, Basler, Leroy Somer, Mecc-Alte and Marelli/Ansaldo. We normally hold around 1000 units in stock at any one time for same day despatch, and custom built units can be supplied on short lead times. Our range covers AVR's for small 2 pole generators up to Static Exciters with excitation currents in excess of 100 amps, as well as AVR's for use with high tension machines up to 11Kv. Our designs include both thyristor phase controlled and transistor pulse width modulated types with accessories such as Power Factor Controllers and Diode Failure Indicators. We can also supply AVR's for DC generators. Other spare parts associated with generators, ie Paralleling C/T's, Rotating Diodes, Power Resistors/Rheostats and Volts Trim Potentiometers are also held in stock. Most other manufacturers AVR's can be repaired if not encapsulated, and a service exchange facility can be provided with certain models. With many years of experience in AVR's and generators, and in particular ECC/ECL, we are able to give advice and assistance for any technical problems which may be encountered. Engineering, term applied to the profession in which a knowledge of the mathematical and natural sciences, gained by study, experience, and practice, is applied to the efficient use of the materials and forces of nature. The term engineer properly denotes a person who has received professional training in pure and applied science, but is often loosely used to describe the operator of an engine, as in the terms locomotive engineer, marine engineer, or stationary engineer. In modern terminology these latter occupations are known as crafts or trades. Between the professional engineer and the craftsperson or tradesperson, however, are those individuals known as subprofessionals or paraprofessionals, who apply scientific and engineering skills to technical problems;
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