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Massie Wireless Station
The Massie Wireless Station (PJ) was built in Point Judith, Rhode Island, in 1907 and may be the oldest surviving working wireless station in the world. It is named for inventor Walter W. Massie, president of the Massie Wireless Telegraph Company. The structure was moved to the New England Wireless and Steam Museum in 1983 where it is preserved as a technology museum and historic site. History In December 1902 the American De Forest Wireless Telegraph Company setup an earlier station in an existing house on a beach near Point Judith Light and another near Block Island Southeast Light, from the coast. By May 1903 they had successfully exchanged test messages. Messages were sent using Morse code. The stations were initially operated for the Providence Journal to send news stories to the island to be printed locally. Another goal was that passing ships could also send messages to the mainland which would then be relayed to Providence or New York City by telephone arriving hours ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East Greenwich, Rhode Island
East Greenwich is a town and the county seat of Kent County, Rhode Island. The population was 14,312 at the 2020 census. East Greenwich is the wealthiest municipality within the state of Rhode Island. It is part of the Providence metropolitan statistical area and the Greater Boston combined statistical area. Formed as Greenwich in 1677, it was named for Greenwich, England. It was renamed Dedford in 1686 but reverted to its original name in 1689. In 1741 the more rural western three-quarters of the town was set off as West Greenwich, the remaining quarter of it thenceforth being called East Greenwich. Until 1854, it was one of the five state capitals for Rhode Island. The General Assembly, when meeting in East Greenwich, used the local courthouse, which is today the town hall. East Greenwich Village is located in the northeastern part of the town and extends north about into the city of Warwick, Rhode Island Warwick ( or ) is a city in Kent County, Rhode Island, the thir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fall River Line
The Fall River Line was a combination steamboat and railroad connection between New York City and Boston that operated between 1847 and 1937. It consisted of a railroad journey between Boston and Fall River, Massachusetts, where passengers would then board steamboats for the journey through Narragansett Bay and Long Island Sound to the line's own Hudson River dock in Manhattan. For many years, it was the preferred route to take for travel between the two major cities. The line was extremely popular, and its steamboats were some of the most advanced and luxurious of their day. Origins The origins of the Fall River Line can be traced back to Colonel Richard Borden, a businessman from Fall River who had established his fortune in the iron and textile industries. He had operated steamboats between Fall River and Providence as early as 1827. In 1846 Richard Borden completed the Fall River Railroad, which enabled a land route between Fall River and other cities such as Taunton, New Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marconi's Wireless Telegraph Company
The Marconi Company was a British telecommunications and engineering company that did business under that name from 1963 to 1987. Its roots were in the Wireless Telegraph & Signal Company founded by Italian inventor Guglielmo Marconi in 1897, which underwent several changes in name after mergers and acquisitions. The company was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful manufacturing companies. In 1999, its defence equipment manufacturing division, Marconi Electronic Systems, merged with British Aerospace (BAe) to form BAE Systems. In 2006, financial difficulties led to the collapse of the remaining company, with the bulk of the business acquired by the Swedish telecommunications company, Ericsson. History Naming history *1897–1900: The Wireless Telegraph & Signal Company *1900–1963: Marconi's Wireless Telegraph Company *1963–1987: Marconi Company Ltd *1987–1998: GEC-Marconi Lt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinking Of The RMS Titanic
The sank in the early morning hours of 15 April 1912 in the North Atlantic Ocean, four days into her maiden voyage from Southampton to New York City. The largest ocean liner in service at the time, ''Titanic'' had an estimated 2,224 people on board when she struck an iceberg at around 23:40 (ship's time) on Sunday, 14 April 1912. Her sinking two hours and forty minutes later at 02:20 (ship's time; 05:18 GMT) on Monday, 15 April, resulted in the deaths of more than 1,500 people, making it one of the deadliest peacetime maritime disasters in history. ''Titanic'' received six warnings of sea ice on 14 April but was travelling about 22 knots when her lookouts sighted the iceberg. Unable to turn quickly enough, the ship suffered a glancing blow that buckled her starboard side and opened six of her sixteen compartments to the sea. ''Titanic'' had been designed to stay afloat with four of her forward compartments flooded but no more, and the crew soon realised that the ship w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrecking Tug
A salvage tug, known also historically as a wrecking tug, is a specialized type of tugboat that is used to rescue ships that are in distress or in danger of sinking, or to salvage ships that have already sunk or run aground. Overview Few tugboats have ever been truly fully dedicated to salvage work; most of the time, salvage tugs operate towing barges, platforms, ships, or performing other utility tugboat work. Tugs fitted out for salvage are found in small quantities around the globe, with higher concentrations near areas with both heavy shipping traffic and hazardous weather conditions. Salvage tugs are used by specialized crew experienced in salvage operations (salvors). Their particular equipment includes: * extensive towing provisions and extra tow lines/cables, with provisions for towing from both bow and stern and at irregular angles * extra cranes * firefighting gear ** deluge systems ** hoses ** nozzles * mechanical equipment such as: ** common mechanical repair parts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distress Call
A distress signal, also known as a distress call, is an internationally recognized means for obtaining help. Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance. A distress signal indicates that a person or group of people, ship, aircraft, or other vehicle is threatened by a serious or imminent danger and requires immediate assistance.Aeronautical Information Manual U.S. Federal Aviation Administration, 2016 Use of distress signals in other circumstances may be against local or . An ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Cod
Cape Cod is a peninsula extending into the Atlantic Ocean from the southeastern corner of mainland Massachusetts, in the northeastern United States. Its historic, maritime character and ample beaches attract heavy tourism during the summer months. The name Cape Cod, coined in 1602 by Bartholomew Gosnold, is the ninth oldest English place-name in the U.S. As defined by the Cape Cod Commission's enabling legislation, Cape Cod is conterminous with Barnstable County, Massachusetts. It extends from Provincetown in the northeast to Woods Hole in the southwest, and is bordered by Plymouth to the northwest. The Cape is divided into fifteen towns, several of which are in turn made up of multiple named villages. Cape Cod forms the southern boundary of the Gulf of Maine, which extends north-eastward to Nova Scotia. Since 1914, most of Cape Cod has been separated from the mainland by the Cape Cod Canal. The canal cuts roughly across the base of the peninsula, though small portions of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bandwidth (signal Processing)
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. It is typically measured in hertz, and depending on context, may specifically refer to ''passband bandwidth'' or ''baseband bandwidth''. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency. Bandwidth in hertz is a central concept in many fields, including electronics, information theory, digital communications, radio communications, signal processing, and spectroscopy and is one of the determinants of the capacity of a given communication channel. A key characteristic of bandwidth is that any band of a given width can carry the same amount of information, regardless of where that band is located in the frequency spectrum. For example, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Frequency
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies; these are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves. Different sources specify different upper and lower bounds for the frequency range. Electric current Electric currents that oscillate at radio frequencies (RF currents) have special properties not shared by direct current or lower audio frequency alternating current, such as the 50 or 60 Hz current used in electrical power distribution. * Energy from RF currents in conductors can radiate into space as electromagnetic waves ( radio waves). This is the basis of radio technology. * RF current does not penetrate deeply into electrical c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wavelength
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats. It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, troughs, or zero crossings, and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns. The inverse of the wavelength is called the spatial frequency. Wavelength is commonly designated by the Greek letter ''lambda'' (λ). The term ''wavelength'' is also sometimes applied to modulated waves, and to the sinusoidal envelopes of modulated waves or waves formed by interference of several sinusoids. Assuming a sinusoidal wave moving at a fixed wave speed, wavelength is inversely proportional to frequency of the wave: waves with higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths. Wavelength depends on the medium (for example, vacuum, air, or water) that a wav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spark-gap Transmitter
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark."Radio Transmitters, Early" in Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the existence of radio waves and studied their properties. A fundamental limitation of spark-gap transmitters is that they generate a series of brief transient pulses of radio waves called damped waves; they are unable to produce the continuous waves used to carry audio (sound) in modern AM or FM radio transmission. So spark-gap transmitters could not transmit audio, and instead transmitted information by radiotelegraphy; the operator switched the transmitter on and off with a telegraph key, creating pulses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightship Nantucket
The station named ''Nantucket'' or ''Nantucket Shoals'' was served by a number of lightvessels (also termed lightships) that marked the hazardous Nantucket Shoals south of Nantucket Island. The vessels, given numbers as their "name," had the station name painted on their hulls when assigned to the station. Several ships have been assigned to the Nantucket Shoals lightship station and have been called ''Nantucket''. It was common for a lightship to be reassigned and then have the new station name painted on the hull. The Nantucket station was a significant US lightship station for transatlantic voyages. Established in 1854, the station marked the limits of the dangerous Nantucket Shoals. She was the last lightship seen by vessels departing the United States, as well as the first beacon seen on approach. The position was southeast of Nantucket Island, the farthest lightship in North America, and experienced clockwise rotary tidal currents. History Lightships and their crews were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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