|
USLHT Jessamine
USLHT ''Jessamine'' was a steam-powered Paddle steamer, sidewheel lighthouse tender built in 1881 for the United States Lighthouse Board. She spent forty years in government service, homeported in Baltimore, Baltimore, Maryland as part of the 5th Lighthouse District. Her primary mission was to build and maintain lighthouses in Chesapeake Bay and nearby waterways in Maryland, Virginia, and North Carolina. Some of the lighthouses she built still stand. In 1922 the ship was sold to private interests. She spent most of the rest of her career carrying freight between Salisbury, Maryland and Baltimore. When competition from trucks on improved roads and bridges rendered her service uneconomic in 1957, she was repurposed to carry bananas from Mexico to Brownsville, Texas. She sank on this route in October 1959. Construction and characteristics During the 2nd session of the 46th Congress, United States Congress, Congress appropriated $90,000 for the construction of two " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennant Of The United States Lighthouse Service
Pennant may refer to: Flag or banner * Pennon (or pennant), a narrow, tapering flag ** Commissioning pennant, the traditional sign of a warship, flown from its masthead while the ship is in commission ** Broad pennant, flown from the masthead of a British Royal Navy ship to indicate the presence of a commodore on board ** Pennant (church), flown by navies during services on board ships * Pennant number, a number used to identify ships by the British Royal Navy and other navies of Europe and the Commonwealth * Pennant (sports), a commemorative flag displayed or flown by a league-winning team ** Pennant race, the race to clinch the division title in a regular baseball season * Pennant, a reference to Flag and pennant patterns in technical analysis of a stock market chart Places * Pennant, Ceredigion, Wales * Pennant, Powys, Wales * Pennant, Saskatchewan, Canada * Pennant Point, Nova Scotia, Canada * Pennant Hills, New South Wales, Australia People * Dafydd Pennant (16th c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salisbury, Maryland
Salisbury () is a city in and the county seat of Wicomico County, Maryland, Wicomico County, Maryland, United States, and the largest city in Eastern Shore of Maryland, the state's Eastern Shore region. The population was 33,050 at the 2020 United States Census, 2020 census. Salisbury is the principal city of the Salisbury metropolitan area, Salisbury, Maryland-Delaware Metropolitan Statistical Area. The city is the commercial hub of the Delmarva Peninsula, which was long devoted to agriculture and had a southern culture. It calls itself "The Comfortable Side of Coastal". History Salisbury's location at the head of Wicomico River (Maryland eastern shore), Wicomico River was a major factor in growth. At first, it was a small colonial outpost set up by Cecilius Calvert, 2nd Baron Baltimore, Lord Baltimore. Salisbury's location at the head of the Wicomico River was seen to be a convenient location for trading purposes. Due to the similar physical attributes as well as the nationalit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Staysail
A staysail ("stays'l") is a fore-and-aft rigged sail whose Sail components#Edges, luff can be affixed to a stays (nautical), stay running forward (and most often but not always downwards) from a mast (sailing), mast to the deck (ship), deck, the bowsprit, or to another mast. Description Most staysails are triangular; however, some are four-cornered, notably some fisherman's staysails. Triangular staysails set forward of the foremost mast are called jibs, headsails, or foresails. The innermost such sail on a Cutter (ship), cutter, schooner, and many other rigs having two or more foresails is referred to simply as ''the staysail'', while the others are referred to as jibs, flying jibs, etc. Types of staysail include the tallboy staysail (a narrow staysail carried between the spinnaker and the mainsail on racing yachts), the Genoa (sail), genoa staysail (a larger one carried inside the spinnaker when broad reaching), and the bigboy staysail (another name for the shooter or bloo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foresail
A foresail is one of a few different types of sail set on the foremost mast (''foremast'') of a sailing vessel: * A fore-and-aft sail set on the foremast of a schooner or similar vessel. * The lowest square sail on the foremast of a full-rigged ship or other vessel which is square-rigged. Sails set forward of the mainmast, such as jibs and staysails, are sometimes referred to as foresails, although "headsails" is a more common term, headsail can also specifically refer to the sail on a forestay that connects directly to the head of the mast. History Foresails set on foremasts between midships and bow were the first type of sail to appear after the mainsail which had been the sole standard rig on sailing vessels for millennia, down to classical antiquity. The earliest foresail, or two-masted ship, has been identified on an Etruscan pyxis from Caere, Italy, dating to the mid-7th century BC: a warship with a furled mainsail is engaging an enemy vessel, deploying a foresai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Derrick
A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. Most derricks have at least two components, either a guyed mast or self-supporting tower, and a boom hinged at its base to provide articulation, as in a ''stiffleg'' derrick. The most basic type of derrick is controlled by three or four lines connected to the top of the mast, which allow it both to move laterally and cant up and down. To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. Forms of derricks are commonly found aboard ships and at docking facilities. Some large derricks are mounted on dedicated vessels, and known as floating derricks and sheerlegs. The term derrick is also applied to the framework supporting a drilling apparatus in an oil rig. The derrick derives its name from a type of gallows named after Thomas Derrick, an Elizabethan era English executioner. Types ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paddle Wheel
A paddle wheel is a form of waterwheel or impeller in which a number of paddles are set around the periphery of the wheel. It has several uses, of which some are: * Very low-lift water pumping, such as flooding paddy fields at no more than about height above the water source. * To move and mix algae culture in the raceway ponds used for algaculture. * Propulsion of watercraft (as a paddlewheel) * Low head hydro power (as a waterwheel) * Flow sensors * Aerators The paddle wheel is an ancient invention but is still used today in a wide range of industrial and agriculture applications. Ship propulsion Paddle wheels would enable ships to travel without needing wind or oars. They were made obsolete by propellers, which had greater propulsion with lower weight and fuel usage. This was demonstrated by an 1845 tug-of-war competition between and with the screw-driven ''Rattler'' pulling the paddle steamer ''Alecto'' backward at . [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horsepower
Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts, and the metric horsepower, which is approximately 735.5 watts. The term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. It was later expanded to include the output power of other types of piston engines, as well as turbines, electric motors and other machinery. The definition of the unit varied among geographical regions. Most countries now use the SI unit watt for measurement of power. With the implementation of the EU Directive 80/181/EEC on 1 January 2010, the use of horsepower in the EU is permitted only as a supplementary unit. History The development of the stea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Steam Engine
A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating steam engines were progressively replaced in marine applications during the 20th century by steam turbines and marine diesel engines. History The first commercially successful steam engine was developed by Thomas Newcomen in 1712. The steam engine improvements brought forth by James Watt in the later half of the 18th century greatly improved steam engine efficiency and allowed more compact engine arrangements. Successful adaptation of the steam engine to marine applications in England would have to wait until almost a century after Newcomen, when Scottish engineer William Symington built the world's "first practical steamboat", the '' Charlotte Dundas'', in 1802. Ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Displacement (ship)
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below. Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage. Calculation The process of determining a vessel's displacement begins with measuring its draft.George, 2005. p.5. This is accomplished by means of its "draft marks" (or "load lines"). A mer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Draft (hull)
The draft or draught of a ship's hull is the vertical distance between the waterline and the bottom of the hull (keel). The draught of the vessel is the maximum depth of any part of the vessel, including appendages such as rudders, propellers and drop keels if deployed. Draft determines the minimum depth of water a ship or boat can safely navigate. The related term air draft is the maximum height of any part of the vessel above the water. The more heavily a vessel is loaded, the deeper it sinks into the water, and the greater its draft. After construction, the shipyard creates a table showing how much water the vessel displaces based on its draft and the density of the water (salt or fresh). The draft can also be used to determine the weight of cargo on board by calculating the total displacement of water, accounting for the content of the ship's bunkers, and using Archimedes' principle. The closely related term "trim" is defined as the difference between the forward and aft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beam (nautical)
The beam of a ship is its width at its widest point. The maximum beam (BMAX) is the distance between planes passing through the outer extremities of the ship, beam of the hull (BH) only includes permanently fixed parts of the hull, and beam at waterline (BWL) is the maximum width where the hull intersects the surface of the water. Generally speaking, the wider the beam of a ship (or boat), the more initial stability it has, at the expense of secondary stability in the event of a capsize, where more energy is required to right the vessel from its inverted position. A ship that heels on her ''beam ends'' has her deck beams nearly vertical. Typical values Typical length-to-beam ratios ( aspect ratios) for small sailboats are from 2:1 (dinghies to trailerable sailboats around ) to 5:1 (racing sailboats over ). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1, while a cor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USLHT Holly (1881)
The USLHT ''Holly'' was one of two Holly-class side wheel bay and sound tenders built in 1881 for service in the Chesapeake Bay region, the other being USLHT ''Jessamine''. Both ships in the class had composite hulls, with wood frames and iron sheathing, and were built by Malster & Reaney of Baltimore, Maryland. The original contract cost was estimated at $37,500 each. However, their actual cost upon completion was $41,911 each. The two ships replaced the lighthouse tenders ''Heliotrope'' and ''Tulip''. Commissioned by the United States Lighthouse Service on 1 September 1881, ''Holly'' was first assigned to the 5th Lighthouse District. She was based out of Baltimore and later Portsmouth for service as an inspection tender. She also serviced aids to navigation in the Chesapeake Bay. In April 1889, President Benjamin Harrison, his family, Secretary of State Blaine and Secretary of the Treasury Windom rode the ''Holly'' down the Potomac River and back. In April 1893, on he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Salisbury, Maryland")
.jpg "Click for more on -> Displacement (ship)")
