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Propeller (other)
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft with an approximately horizontal axis. History Early developments The principle employed in using a screw propeller is derived from stern sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the blade to the water at the effective angl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bamboo-copter
The bamboo-copter, also known as the bamboo dragonfly or Chinese top ( Chinese ''zhuqingting'' (竹蜻蜓), Japanese ''taketonbo'' ), is a toy helicopter rotor that flies up when its shaft is rapidly spun. This helicopter-like top originated in Jin dynasty China around 320 AD, and was the object of early experiments by English engineer George Cayley, the inventor of modern aeronautics.Leishman, J. Gordon (2006)''Principles of Helicopter Aerodynamics'' Cambridge University Press. pp. 7–9. In China, the earliest known flying toys consisted of feathers at the end of a stick, which was rapidly spun between the hands and released into flight. "While the Chinese top was no more than a toy, it is perhaps the first tangible device of what we may understand as a helicopter." The Jin dynasty Daoist philosopher Ge Hong's (c. 317) book ''Baopuzi'' (抱樸子 "Master Who Embraces Simplicity") mentioned a flying vehicle in what Joseph Needham calls "truly an astonishing passage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yarmouth, Nova Scotia
Yarmouth is a town in southwestern Nova Scotia, Canada. A port town, industries include fishing, and tourism. It is the terminus of a ferry service to Bar Harbor, Maine, run by Bay Ferries. History Originally inhabited by the Mi'kmaq, the region was known as "Keespongwitk" meaning "Lands End" due to its position at the tip of the Nova Scotia peninsula. European settlement The region was visited in 1604 by Samuel de Champlain, who named it "Cap-Fourchu", meaning "forked or cloven cape." The first Europeans to make a settlement on these shores were the French Acadians. They set up a small fishing settlement known as "Tebouque" in the mid 1600s and by 1750 the population was 50 people. During the Seven Years' War, New England Planters settled at what is now the town of Yarmouth in 1759; the grantees were from Yarmouth, Massachusetts and they requested that Yarmouth be named after their former home. Yarmouth was founded on June 9, 1761, when a ship carrying three families arriv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Patch
John Patch (1781 – August 27, 1861) was a Nova Scotian fisherman who invented one of the first versions of the screw propeller. Early life Patch was born in Yarmouth, Nova Scotia in 1781. His father Nehemiah was a Yarmouth sea captain who died in a shipwreck at Seal Island, Nova Scotia soon after John Patch's birth. Fishing career Earning a living as a mariner and fishermen, Patch observed the efficiency of small boats propelled by single oar sculling and began to experiment with a propeller based in the motions of a sculling oar. During the winter of 1832-1833 he built a hand-cranked version of a doubled-bladed fan-shaped propeller. He demonstrated his propeller during the summer of 1833 before crowds watching as his small boat moved, seemingly magically, across Yarmouth Harbour. Patch further experimented by attaching his invention to a 25-ton coastal schooner named ''Royal George'' in the Bay of Fundy. The propeller allowed ''Royal George'' to enter Saint John Harbour in a ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Josef Ressel
Joseph Ludwig Franz Ressel ( cs, Josef Ludvík František Ressel; June 29, 1793 – October 9, 1857) was a forester and inventor of Czech- Austrian descent, who designed one of the first working ship's propellers. Ressel was born in Chrudim, Bohemia then part of the Holy Roman Empire ruled by the Habsburg monarchy, which became part of the Austrian Empire at his death (now the Czech Republic). His father Anton Hermann Ressel was a native German speaker, and his mother Marie Anna Konvičková was a native Czech speaker. He studied at the Linz Gymnasium, Budweis (in today's České Budějovice) artillery school, University of Vienna and the Mariabrunn Forestry Academy at Mariabrunn Monastery then near (now in) Vienna. He worked for the Austrian government as a forester in the more southern parts of the monarchy, including in Motovun, Istria (modern-day Croatia). His work was to secure a supply of quality wood for the Navy./nowiki>''Josef Ressel. One of the designers of a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Stevens (inventor, Born 1749)
Col. John Stevens, III (June 26, 1749 – March 6, 1838) was an American lawyer, engineer, and inventor who constructed the first U.S. steam locomotive, first steam-powered ferry, and first U.S. commercial ferry service from his estate in Hoboken. He was influential in the creation of U.S. patent law. Early life Stevens was born June 26, 1749, in New York City, New York. He was the only son of John Stevens Jr. (1715–1792), a prominent state politician who served as a delegate to the Continental Congress, and Elizabeth Alexander (1726–1800). His sister, Mary Stevens (d. 1814), married Robert R. Livingston, the first Chancellor of the State of New York. His maternal grandparents were James Alexander (1691–1756), the Attorney General of New Jersey, and Mary (née Spratt) Provoost Alexander (1693–1760), herself a prominent merchant in New York City. His paternal grandfather, John Stevens, emigrated from London England around 1695, and was married to Mary Campbell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Shorter
Edward Shorter (1767-1836) was an English engineer and inventor of several useful inventions including an early screw propeller. Early life Edward was born in London on 3 December 1767 in the parish of St Sepulchre, Newgate to Robert and Ann Shorter. His father Robert was an impoverished weaver, and while he had been indentured with the Company of Weavers in Basingstoke Street in 1756, and completed his apprenticeship, it is clear that he had insufficient income to support the family. Some time around 1770 the family had to move into the parish workhouse (Chick Lane) to support themselves. Edward’s sister Rachel passed away in 1774 in the Workhouse and Edward was discharged in 1775. Life It is unclear when and through whom Edward learned his trade, however prior to 1798 he had obtained Freedom of the City and was working as a clockmaker in Giltspur Street, London. Together with colleague William Anthony, the renowned watchmaker of Red Lion Street, he succeeded in obtain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Jefferson
Thomas Jefferson (April 13, 1743 – July 4, 1826) was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third president of the United States from 1801 to 1809. He was previously the nation's second vice president under John Adams and the first United States secretary of state under George Washington. The principal author of the Declaration of Independence, Jefferson was a proponent of democracy, republicanism, and individual rights, motivating American colonists to break from the Kingdom of Great Britain and form a new nation. He produced formative documents and decisions at state, national, and international levels. During the American Revolution, Jefferson represented Virginia in the Continental Congress that adopted the Declaration of Independence. As a Virginia legislator, he drafted a state law for religious freedom. He served as the second Governor of Virginia from 1779 to 1781, during the Revolutionary War. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York Harbor
New York Harbor is at the mouth of the Hudson River where it empties into New York Bay near the East River tidal estuary, and then into the Atlantic Ocean on the east coast of the United States. It is one of the largest natural harbors in the world, and is frequently named the best natural harbor in the world. It is also known as Upper New York Bay, which is enclosed by the New York City boroughs of Manhattan, Brooklyn, and Staten Island and the Hudson County, New Jersey municipalities of Jersey City and Bayonne. The name may also refer to the entirety of New York Bay including Lower New York Bay. Although the United States Board on Geographic Names does not use the term, ''New York Harbor'' has important historical, governmental, commercial, and ecological usages. Overview The harbor is fed by the waters of the Hudson River (historically called the North River as it passes Manhattan), as well as the Gowanus Canal. It is connected to Lower New York Bay by the Na ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saybrook, Connecticut
Deep River is a town in Middlesex County, Connecticut. The population was 4,415 at the 2020 census. The town center is designated by the U.S. Census Bureau as a census-designated place (CDP). Deep River is part of what the locals call the "Tri-town Area", made up of the towns of Deep River, Chester, and Essex. Geography According to the United States Census Bureau, the town has a total area of , of which is land and (4.30%) is water. The CDP has a total area of , of which 4.38% is water. Principal communities * Deep River Center *Winthrop History Saybrook Colony formally joined Connecticut in 1644. The portion of the original colony east of the Connecticut River was set off as a separate town in 1665. The site of the present village of Deep River was said to have been owned by John, Nathaniel, and Philip Kirtland in 1723.J.B. Beers and Co., ''History of Middlesex County'' The village of Winthrop was said to have been settled by Baptists as early as 1729. In the early to mid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isaac Doolittle
Isaac Doolittle (August 3, 1721 – February 13, 1800) was an early American clockmaker, inventor, engineer, manufacturer, militia officer, entrepreneur, printer, politician, and brass, iron, and silver artisan. Doolittle was a watchmaker and clockmaker, known for making and selling at his shop in New Haven, Connecticut one of the first brass wheel hall clocks in America, where he also crafted and sold scientific instruments, and is regarded as "the first native practitioner" of silversmithing in the Connecticut Colony. He was also an engraver and printer of both legal forms and currency, and became the first American to design, manufacture, and sell a printing press in 1769. Somewhat late in life, he became a successful self-educated bell-foundryman, learning the difficult craft of casting large metal bells. Doolittle was an important figure in the religious life of Connecticut as an Episcopal Churchwarden and co-founder of Trinity Church on the Green in New Haven. Called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Bushnell
David Bushnell (August 30, 1740 – 1824 or 1826), of Westbrook, Connecticut, was an American inventor, a patriot, one of the first American combat engineers, a teacher, and a medical doctor. Bushnell invented the first submarine to be used in battle, as well as a floating mine triggered by contact. He was a veteran of the Revolutionary War. Early life David Bushnell was born in a secluded part of Saybrook, Connecticut on the 30th August, 1740 and baptized in 1743 into a farming family in what is now Westbrook, Connecticut where his parents Nehemiah Bushnell (1710 – d. bef 1762) and Sarah (Susan) Ingham Bushnell owned a farm. He was the first of five children born. Following the death of his father circa 1769, he sold his half interest in the family Westbrook farm to his brother Ezra and entered Yale College in 1771 at the relatively old age of 31. The ''Turtle'' submarine Bushnell is credited with creating the first submarine ever used in combat, while studying at Ya ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
