A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be transformed, by a connecting rod and crank, into rotational force for work. The term "steam engine" is generally applied only to reciprocating engines as just described, not to the steam turbine. Steam engines are external combustion engines, where the working fluid is separated from the combustion products. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle. In general usage, the term steam engine can refer to either complete steam plants, such as railway steam locomotives and portable engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine.
A steamship, often referred to as a steamer, is a type of steam-powered vessel, typically ocean-faring and seaworthy, that is propelled by one or more steam engines that typically move (turn) propellers or paddlewheels. The first steamships came into practical usage during the early 1800s; however, there were exceptions that came before. Steamships usually use the prefix designations of "PS" for paddle steamer or "SS" for screw steamer. As paddle steamers became less common, "SS" is assumed by many to stand for "steamship". Ships powered by internal combustion engines use a prefix such as "MV" for motor vessel, so it is not correct to use "SS" for most modern vessels.
A steamboat is a boat that is propelled primarily by steam power, typically driving propellers or paddlewheels. Steamboats sometimes use the prefix designation SS, S.S. or S/S or PS ; however, these designations are most often used for steamships.
Steam power developed slowly over a period of several hundred years, progressing through expensive and fairly limited devices in the early 17th century, to useful pumps for mining in 1700, and then to Watt's improved steam engine designs in the late 18th century. It is these later designs, introduced just when the need for practical power was growing due to the Industrial Revolution, that truly made steam power commonplace.
A compound steam engine unit is a type of steam engine where steam is expanded in two or more stages. A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure (HP) cylinder, then having given up heat and losing pressure, it exhausts directly into one or more larger-volume low-pressure (LP) cylinders. Multiple-expansion engines employ additional cylinders, of progressively lower pressure, to extract further energy from the steam.
Wide West was a steamboat that served in the Pacific Northwest of the United States. It had a reputation as a luxury boat of its days.
Willapa Bay is a large shallow body of water near the Pacific Ocean in southwestern Washington. For a number of years before modern roads were built in Pacific County, Washington, the bay was used as the means of travel around the county, by powered and unpowered craft, including several steamboats.
The first recorded rudimentary steam engine was the aeolipile mentioned by Vitruvius between 30 and 15 BC and, described by Heron of Alexandria in 1st-century Roman Egypt. Several steam-powered devices were later experimented with or proposed, such as Taqi al-Din's steam jack, a steam turbine in 16th-century Ottoman Egypt, and Thomas Savery's steam pump in 17th-century England. In 1712, Thomas Newcomen's atmospheric engine became the first commercially successful engine using the principle of the piston and cylinder, which was the fundamental type of steam engine used until the early 20th century. The steam engine was used to pump water out of coal mines.
Baltimore is a preserved steam-powered tugboat, built in 1906 by the Skinner Shipbuilding Company of Baltimore, Maryland. She is formerly the oldest operating steam tugboat in the United States, but at present does not hold an operating license issued by the US Coast Guard, so is unable to leave her dock at the Baltimore Museum of Industry on Key Highway, Baltimore. Her hull is not capable of operating on open water. Baltimore was built and operated as a harbor inspection tug, capable of acting as a municipal tugboat for city barges, as well as an official welcoming vessel and VIP launch, an auxiliary fireboat, and as a light icebreaker.
Steamboats played a major role in the 19th-century development of the Mississippi River and its tributaries, allowing practical large-scale transport of passengers and freight both up- and down-river. Using steam power, riverboats were developed during that time which could navigate in shallow waters as well as upriver against strong currents. After the development of railroads, passenger traffic gradually switched to this faster form of transportation, but steamboats continued to serve Mississippi River commerce into the early 20th century. A small number of steamboats are still used for tourist excursions in the 21st century.
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.
The Allaire Iron Works was a leading 19th-century American marine engineering company based in New York City. Founded in 1816 by engineer and philanthropist James P. Allaire, the Allaire Works was one of the world's first companies dedicated to the construction of marine steam engines, supplying the engines for more than 50% of all the early steamships built in the United States.
The steamer Chautauqua Belle is an authentic Mississippi River-style sternwheel steamboat owned and operated by U.S. Steam Lines Ltd, operating on Chautauqua Lake in Western New York.
Humphrys, Tennant and Dykes was a British engineering company based in Deptford, London, England.
A steeple compound engine is a form of tandem compound steam engine that is constructed as an inverted vertical engine. Because of their great height, they became known as "steeple" engines.
Thomas Powell was a fast and popular steamboat built in Manhattan, New York City in 1846 for service on the Hudson River. She ran between New York City and various Hudson River destinations during her career, including Newburgh, Piermont, Poughkeepsie, Rondout, Catskill, and finally as a nightboat to Troy. She also ran on the Delaware River for some years in the 1850s, and during the American Civil War served as a Union Army dispatch boat.
Santa Claus was a sidewheel passenger-and-freight steamboat built in 1845 for service on the Hudson River between Wilbur, New York, and New York City. In her first few years of operation, Santa Claus saw service on a number of different Hudson River routes, most notably between Albany and New York City. She was also employed from time to time as an excursion steamer. A highlight of her career occurred in 1852, when she had the honor of conveying the remains of American statesman Henry Clay from New York City to Albany en route to their final resting place.
The Callendar Navigation Company, sometimes seen as the Callendar Transportation Company, started in business in the early 1900s. Callendar was formed in the early 1900s, and was based in Astoria, Oregon. Callender was to become one of six large towing companies of the Columbia and Willamette rivers in the early decades of the 1900s, the others being Shaver Transportation, Smith Transportation, Hosford, Knappton Towing Co., and Willamette and Columbia River Towing Co. In 1922, Callendar Navigation merged with Knappton Towboat Co., which existed, with a name change in 1990, and which became part of Foss Marine in 1993.
Hercules was a Dutch steam paddle tugboat. She was also the first vessel to effectively use a compound steam engine. In about 1890, a discussion about the invention of the compound steam engine made that Fijenoord brought up the blueprints of Hercules. These proved that Gerhard Moritz Roentgen had invented the compound steam engine.
