|
Diaphone Lampra
The diaphone is a noisemaking device best known for its use as a foghorn: It can produce deep, powerful tones, able to carry a long distance. Although they have fallen out of favor, diaphones were also used at some fire stations and in other situations where a loud, audible signal was required. History The diaphone horn was based directly on the organ stop of the same name invented by Robert Hope-Jones, creator of the Wurlitzer organ. Hope-Jones' design was based on a piston that was closed only at its bottom end and had slots, perpendicular to its axis, cut through its sides; the slotted piston moved within a similarly slotted cylinder. Outside of the cylinder was a reservoir of high-pressure air. Initially, high-pressure air would be admitted behind the piston, pushing it forward. When the slots of the piston aligned with those of the cylinder, air passed into the piston, making a sound and pushing the piston back to its starting position, whence the cycle would repeat. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type B And Type F Diaphone Side By Side
Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS command), a command to display contents of a file. * Type (Unix), a command in POSIX shells that gives information about commands. * Type safety, the extent to which a programming language discourages or prevents type errors. * Type system, defines a programming language's response to data types. Mathematics * Type (model theory) * Type theory, basis for the study of type systems * Arity or type, the number of operands a function takes * Type, any proposition or set in the intuitionistic type theory * Type, of an entire function ** Exponential type Biology * Type (biology), which fixes a scientific name to a taxon * Dog type, categorization by use or function of domestic dogs Lettering * Type is a design concept for lettering used in typography which helped bring about modern textual printin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lifebuoy (soap)
Lifebuoy is a brand of soap marketed by Unilever. Lifebuoy was originally, and for much of its history, a carbolic soap containing phenol (carbolic acid, a compound extracted from coal tar). The soaps manufactured today under the Lifebuoy brand do not contain phenol. Currently, there are many varieties of Lifebuoy. History Lifebuoy was introduced by Lever Brothers in 1895 in the United Kingdom. Originally a carbolic soap containing phenol, different varieties were later introduced without the medicinal carbolic smell, such as the coral-coloured Lifebuoy during the late 1950s and Lifebuoy Minty Refresher in 1966. Lifebuoy was one of the most popular soaps in the United States from approximately 1923 to the mid-‘50s, Although Lifebuoy is no longer produced in the US and UK, it is still being mass-produced by Unilever in Cyprus for the UK, EU (on hold and under investigation) and Brazilian markets, in Trinidad and Tobago for the Caribbean market, and in India for the Asian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Civil Defense Siren
A civil defense siren, also known as an air-raid siren or tornado siren, is a siren used to provide an emergency population warning to the general population of approaching danger. It is sometimes sounded again to indicate the danger has passed. Some sirens, especially within small towns, are also used to call the volunteer fire department when needed. Initially designed to warn city dwellers of air raids in World War II, they were later used to warn of nuclear attack and natural destructive weather patterns, such as tornadoes. The generalized nature of sirens led to many of them being replaced with more specific warnings, such as the broadcast-based Emergency Alert System and the Cell Broadcast-based Wireless Emergency Alerts and EU-Alert mobile technologies. A mechanical siren generates sound by spinning a slotted chopper wheel to interrupt a stream of air at a regular rate. Modern sirens can develop a sound level of up to 135 decibels at . The Chrysler air raid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newton, Massachusetts
Newton is a city in Middlesex County, Massachusetts, United States. It is approximately west of downtown Boston. Newton resembles a patchwork of thirteen villages, without a city center. According to the 2020 U.S. Census, the population of Newton was 88,923. History Newton was settled in 1630 as part of "the newe towne", which was renamed Cambridge in 1638. Roxbury minister John Eliot persuaded the Native American people of Nonantum, a sub-tribe of the Massachusett led by a sachem named Waban, to relocate to Natick in 1651, fearing that they would be exploited by colonists. Newton was incorporated as a separate town, known as Cambridge Village, on December 15, 1681, then renamed Newtown in 1691, and finally Newton in 1766. It became a city on January 5, 1874. Newton is known as ''The Garden City''. In ''Reflections in Bullough's Pond'', Newton historian Diana Muir describes the early industries that developed in the late 18th and early 19th centuries in a series of mills b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martha's Vineyard
Martha's Vineyard, often simply called the Vineyard, is an island in the Northeastern United States, located south of Cape Cod in Dukes County, Massachusetts, known for being a popular, affluent summer colony. Martha's Vineyard includes the smaller adjacent Chappaquiddick Island, which is usually connected to the Vineyard. The two islands have sometimes been separated by storms and hurricanes, which last occurred from 2007 to 2015. It is the 58th largest island in the U.S., with a land area of about , and the third-largest on the East Coast, after Long Island and Mount Desert Island. Martha's Vineyard constitutes the bulk of Dukes County, which also includes the Elizabeth Islands and the island of Nomans Land (Massachusetts), Nomans Land. The Vineyard was home to one of the earliest known deaf communities in the United States; consequently, a sign language, the Martha's Vineyard Sign Language, emerged on the island among both deaf and hearing islanders. The 2010 census report ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edgartown
Edgartown is a tourist destination on the island of Martha's Vineyard in Dukes County, Massachusetts, United States, for which it is the county seat. It was once a major whaling port, with historic houses that have been carefully preserved. Today it hosts yachting events around its large harbour. It includes the smaller island of Chappaquiddick. Edgartown is a part of Massachusetts's 9th congressional district, represented in the Massachusetts Senate as a portion of the Cape and Islands district. The town's population was 5,168 at the 2020 census. History In 1642, Rev. Thomas Mayhew, Jr. led a group of families to start a colony on the island after its purchase by his father Thomas Mayhew. Originally called ''Great Harbor'', it was incorporated on July 8, 1671, as ''Edgar Towne'', named for Edgar, whose father James II of England, was heir presumptive to the English throne. Those who chose the name to honor the monarchy did not know Edgar had died at the age of three on J ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Horn
An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder. Air horns are widely employed as vehicle horns, installed on large buses, semi-trailer trucks, fire trucks, trains, and some ambulances as a warning device, and on ships as a signaling device. Operation An air horn consists of a flaring metal or plastic horn or trumpet (called the "bell") attached to a small air chamber containing a metal reed or diaphragm in the throat of the horn. Compressed air flows from an inlet line through a narrow opening past the reed or diaphragm, causing it to vibrate, which creates sound waves. The flaring horn serves as an acoustic impedance transformer to improve the transfer of sound ener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fresnel Lens
A Fresnel lens ( ; ; or ) is a type of composite compact lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships." The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. The simpler dioptric (purely refractive) form of the lens was first proposed by Count Buffon and independently reinvented by Fresnel. The ''catadioptric'' form of the lens, entirely invented by Fresnel, has outer elements that use total internal reflection as well as refraction; it can capture more oblique light from a light source and add it to the beam of a lighthouse, making the light visible from greater distances. Description The Fresnel lens redu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands within the British Isles. Northern Ireland shares a land border with the Republic of Ireland; otherwise, the United Kingdom is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. The total area of the United Kingdom is , with an estimated 2020 population of more than 67 million people. The United Kingdom has evolved from a series of annexations, unions and separations of constituent countries over several hundred years. The Treaty of Union between the Kingdom of England (which included Wales, annexed in 1542) and the Kingdom of Scotland in 170 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birmingham
Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the West Midlands metropolitan county, and approximately 4.3 million in the wider metropolitan area. It is the largest UK metropolitan area outside of London. Birmingham is known as the second city of the United Kingdom. Located in the West Midlands region of England, approximately from London, Birmingham is considered to be the social, cultural, financial and commercial centre of the Midlands. Distinctively, Birmingham only has small rivers flowing through it, mainly the River Tame and its tributaries River Rea and River Cole – one of the closest main rivers is the Severn, approximately west of the city centre. Historically a market town in Warwickshire in the medieval period, Birmingham grew during the 18th century during the Midla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chance Brothers
Chance Brothers and Company was a glassworks originally based in Spon Lane, Smethwick, West Midlands (formerly in Staffordshire), in England. It was a leading glass manufacturer and a pioneer of British glassmaking technology. The Chance family originated in Bromsgrove in Worcestershire as farmers and craftsmen, before setting up business in Smethwick in 1822. Situated between Birmingham and the Black Country in the agglomeration of the Midlands industrial heartland, they took advantage of the skilled workers, canals and many advances that were taking place in the industrial West Midlands at the time. Throughout its almost two centuries of history many changes affected the company which, now privatised, continues to function as Chance Glass Limited, a specialised industrial glass manufacturer in Malvern, Worcestershire at one of its small subsidiary factories. The social and economic impact of the company on the region is the subject of a project sponsored by the Heritage Lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engagement
An engagement or betrothal is the period of time between the declaration of acceptance of a marriage proposal and the marriage itself (which is typically but not always commenced with a wedding). During this period, a couple is said to be ''fiancés'' (from the French), ''betrothed,'' ''intended'', ''affianced'', ''engaged to be married,'' or simply ''engaged''. Future brides and grooms may be called ''fiancée'' (feminine) or ''fiancé'' (masculine), ''the betrothed'', a ''wife-to-be'' or ''husband-to-be'', respectively. The duration of the courtship varies vastly, and is largely dependent on cultural norms or upon the agreement of the parties involved. Long engagements were once common in formal arranged marriages, and it was not uncommon for parents betrothing children to arrange marriages many years before the engaged couple were old enough. This is still done in some countries. Many traditional Christian denominations have optional rites for Christian betrothal (also k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> United Kingdom")
.jpg "Click for more on -> Engagement")