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Spencer Heath
Spencer Heath (January 3, 1876, Vienna, Virginia – October 6, 1963, Leesburg, Virginia) was an American engineer, attorney, inventor, manufacturer, horticulturist, poet, philosopher of science and social thinker.Spencer Heath MacCallum"The Quickening of Social Evolution: Negotiating the Last Rapids" ''The Independent Review - A Journal of Political Economy'', Vol. II No. 2 (Fall 1997). A dissenter from the prevailing Georgist views, he pioneered the theory of proprietary governance and community in his book ''Citadel, Market and Altar''.Fred E. Foldvary Heath: estranged Georgist American Journal of Economics and Sociology, April, 2004. Foldvary’s writings on Heath also were published as chapter 28 of Robert V. Andelson’s book ''Critics of Henry George: An Appraisal of Their Strictures on Progress and Poverty,'' Blackwell Publishing, 2004. His grandson, Spencer Heath MacCallum, popularized and expounded on his ideas, most notably in his book ''The Art of Community''.Spenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vienna, Virginia
Vienna () is a town in Fairfax County, Virginia, United States. As of the 2020 U.S. census, Vienna has a population of 16,473. Significantly more people live in ZIP codes with the Vienna postal addresses (22180, 22181, and 22182), bordered approximately by Interstate 66 on the south, Interstate 495 on the east, Route 7 to the north, and Hunter Mill Road to the west, than in the town itself. History Non-native settlement in the region dates to ca. 1740. In 1754, prominent soldier and land owner Colonel Charles Broadwater settled within the town boundaries. Broadwater's son-in-law, John Hunter built the first recorded house there in 1767, naming it Ayr Hill to recall his birthplace, Ayr, Scotland. That name was then applied to the tiny developing community. The name of the town was changed in the 1850s, when a doctor, William Hendrick, settled there if the town renamed itself after his hometown, Phelps, New York, which was then known as Vienna. On June 17, 1861, a relatively-mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of The Navy
The United States Department of the Navy (DoN) is one of the three military departments within the Department of Defense of the United States of America. It was established by an Act of Congress on 30 April 1798, at the urging of Secretary of War James McHenry, to provide a government organizational structure to the United States Navy (USN);Bernard C. Steiner and James McHenry, The life and correspondence of James McHenry' (Cleveland: Burrows Brothers Co., 1907). since 1834, it has exercised jurisdiction over the U.S. Marine Corps (USMC) and, during wartime, the U.S. Coast Guard (USCG), though each remains an independent service branch. It is led by the Secretary of the Navy (SECNAV), a statutory civilian officer. The Department of the Navy was an executive department, whose secretary served on the president's cabinet, until 1949, when amendments to the National Security Act of 1947 established the Department of Defense as a unified department for all military service ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Controllable Pitch Propeller
In marine propulsion, a variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution. A controllable pitch propeller (CPP) can be efficient for the full range of rotational speeds and load conditions, since its pitch will be varied to absorb the maximum power that the engine is capable of producing. When fully loaded, a vessel will need more propulsion power than when empty. By varying the propeller blades to the optimal pitch, higher efficiency can be obtained, thus saving fuel. A vessel with a VPP can accelerate faster from a standstill and can decelerate much more effectively, making stopping quicker and safer. A CPP can also improve vessel maneuverability by directing a stronger flow of water onto the ru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting occurring throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died in genocides within the Ottoman Empire and in the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war. Prior to 1914, the European great powers were divided between the Triple Entente (comprising France, Russia, and Britain) and the Triple Alliance (containing Germany, Austria-Hungary, and Italy). Tensions in the Balkans came to a head on 28 June 1914, following the assassination of Archduke Franz Ferdin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller (aircraft)
An aircraft propeller, also called an airscrew,Beaumont, R.A.; ''Aeronautical Engineering'', Odhams, 1942, Chapter 13, "Airscrews". converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards. It comprises a rotating power-driven hub, to which are attached several radial airfoil-section blades such that the whole assembly rotates about a longitudinal axis. The blade pitch may be fixed, manually variable to a few set positions, or of the automatically variable "constant-speed" type. The propeller attaches to the power source's driveshaft either directly or through reduction gearing. Propellers can be made from wood, metal or composite materials. Propellers are most suitable for use at subsonic airspeeds generally below about , although supersonic speeds were achieved in the McDonnell XF-88B experimental propeller-equipped aircraft. Supersonic tip-speeds are used in some aircraft like the Tupolev Tu-95, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airplane
An airplane or aeroplane (informally plane) is a fixed-wing aircraft that is propelled forward by thrust from a jet engine, propeller, or rocket engine. Airplanes come in a variety of sizes, shapes, and wing configurations. The broad spectrum of uses for airplanes includes recreation, transportation of goods and people, military, and research. Worldwide, commercial aviation transports more than four billion passengers annually on airliners and transports more than 200 billion tonne-kilometersMeasured in RTKs—an RTK is one tonne of revenue freight carried one kilometer. of cargo annually, which is less than 1% of the world's cargo movement. Most airplanes are flown by a pilot on board the aircraft, but some are designed to be remotely or computer-controlled such as drones. The Wright brothers invented and flew the first airplane in 1903, recognized as "the first sustained and controlled heavier-than-air powered flight". [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Propeller Manufacturing Company
American Propeller and Manufacturing Company, in Baltimore manufactured 75 percent of all propellers used by America in World War I. History APMC was founded by a patent lawyer and engineering consultant Spencer Heath. His clients included Simon Lake, inventor of the even-keel-submerging submarine, and Emile Berliner, inventor of the flat-disk phonograph record. Heath helped Berliner design and build the first rotary engine blades used in helicopters while working in Washington as general manager of the Gyro Motor Company.Alvin Lowi, Jr., P.E.The Legacy of Spencer Heath July 13, 2006. Heath developed and first mass-produced airplane propellers at APMC. In 1922 he founded Paragon Engineers inc, and demonstrated the first engine-powered and controlled, variable and reversible pitch propeller. AMPC was initially founded in Washington D.C to build low-production experimental and custom propellers under the name Paragon. In 1912 the company moved to Baltimore, Maryland. Initial pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopters
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of STOL (Short TakeOff and Landing) or STOVL (Short TakeOff and Vertical Landing) aircraft cannot perform without a runway. In 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production.Munson 1968.Hirschberg, Michael J. and David K. Dailey"Sikorsky". ''US and Russian Helicopter Development in the 20th Century'', American Helicopter Society, International. 7 July 2000. Although most earlier designs used more than one main rotor, the configuration of a single main rotor accompanied by a vertical anti-torque tail rotor (i.e. unicopter, not to be confused with the single-blade monocopter) has become the most common h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotary Engine
The rotary engine is an early type of internal combustion engine, usually designed with an odd number of cylinders per row in a radial configuration. The engine's crankshaft remained stationary in operation, while the entire crankcase and its attached cylinders rotated around it as a unit. Its main application was in aviation, although it also saw use in a few early motorcycles and automobiles. This type of engine was widely used as an alternative to conventional inline engines (straight or V) during World War I and the years immediately preceding that conflict. It has been described as "a very efficient solution to the problems of power output, weight, and reliability". By the early 1920s, the inherent limitations of this type of engine had rendered it obsolete. Description Distinction between "rotary" and "radial" engines A rotary engine is essentially a standard Otto cycle engine, with cylinders arranged radially around a central crankshaft just like a conventional ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emile Berliner
Emile Berliner (May 20, 1851 – August 3, 1929) originally Emil Berliner, was a German-American inventor. He is best known for inventing the lateral-cut flat disc record (called a "gramophone record" in British and American English) used with a gramophone. He founded the United States Gramophone Company in 1894;Library of Congress"Emile Berliner and the Birth of the Recording Industry: The Gramophone" Retrieved 2017-01-19. The Gramophone Company in London, England, in 1897; Deutsche Grammophon in Hanover, Germany, in 1898; and Berliner Gram-o-phone Company of Canada in Montreal in 1899 (chartered in 1904). Berliner also invented what was probably the first radial aircraft engine (1908), a helicopter (1919), and acoustical tiles (1920s). Early life Berliner was born in Hanover, Germany, in 1851 into a Jewish merchant family. Though Jewish, his religious persuasion would develop into agnosticism. He completed an apprenticeship to become a merchant, as was family tradition. Whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simon Lake
Simon Lake (September 4, 1866 – June 23, 1945) was a Quaker American mechanical engineer and naval architect who obtained over two hundred patents for advances in naval design and competed with John Philip Holland to build the first submarines for the United States Navy. Biography Born in Pleasantville, New Jersey on September 4, 1866. Lake joined his father's foundry business after attending public schools in New Jersey and Pennsylvania. Lake had a strong interest in undersea travel. He built his first submarine, ''Argonaut Junior'', in 1894 in response to an 1893 request from the US Navy for a submarine torpedo boat. In 1898 he followed up with the Argonaut (submarine), ''Argonaut 1'', which he sailed from Norfolk, Virginia for to Sandy Hook, New Jersey (which is actually north of Norfolk), arriving in November of 1898. As a result of lessons learned on that journey, he rebuilt it into the Argonaut (submarine), ''Argonaut 2''. Neither ''Argonaut'' nor Lake's following sub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Consultant
A consultant (from la, consultare "to deliberate") is a professional (also known as ''expert'', ''specialist'', see variations of meaning below) who provides advice and other purposeful activities in an area of specialization. Consulting services generally fall under the domain of professional services, as contingent work. A consultant is employed or involved in giving professional advice to the public or to those practicing the profession. Definition and distinction The Harvard Business School provides a more specific definition of a consultant as someone who advises on "how to modify, proceed in, or streamline a given process within a specialized field". In his book, ''The Consulting Bible'', Alan Weiss defines that "When we onsultantswalk away from a client, the client's conditions should be better than it was before we arrived or we've failed." There is no legal protection given to the job title 'consultant'.Consultancy.ukWhat is a consultant? accessed 29 June 2021 S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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