SS'' Sankt Erik'' is an

icebreaker An icebreaker is a special-purpose ship or boat designed to move and navigate through ice-covered waters, and provide safe waterways for other boats and ships. Although the term usually refers to ice-breaking ships, it may also refer to smaller ...

and

museum ship A museum ship, also called a memorial ship, is a ship that has been preserved and converted into a museum open to the public for educational or memorial purposes. Some are also used for training and recruitment purposes, mostly for the small numb ...

attached to the

Vasa Museum The Vasa Museum ( sv, Vasamuseet) is a maritime museum in Stockholm, Sweden. Located on the island of Djurgården, the museum displays the only almost fully intact 17th-century ship that has ever been salvaged, the 64-gun warship '' Vasa'' that sa ...

Stockholm Stockholm () is the Capital city, capital and List of urban areas in Sweden by population, largest city of Sweden as well as the List of urban areas in the Nordic countries, largest urban area in Scandinavia. Approximately 980,000 people liv ...

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

. She was launched in 1915 as ''Isbrytaren II'' ("Ice breaker II") and was a conventionally-built Baltic icebreaker with a strengthened bow shaped to be lifted up onto the

ice Ice is water frozen into a solid state, typically forming at or below temperatures of 0 degrees Celsius or Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaq ...

to crush it and a forward-facing

screw A screw and a bolt (see '' Differentiation between bolt and screw'' below) are similar types of fastener typically made of metal and characterized by a helical ridge, called a ''male thread'' (external thread). Screws and bolts are used to fa ...

to push water and crushed ice along the side of the

hull Hull may refer to: Structures * Chassis, of an armored fighting vehicle * Fuselage, of an aircraft * Hull (botany), the outer covering of seeds * Hull (watercraft), the body or frame of a ship * Submarine hull Mathematics * Affine hull, in affi ...

. She also has heeling tanks which can be filled and emptied with

seawater Seawater, or salt water, is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, 35 ppt, 600 mM). This means that every kilogram (roughly one liter by volume) of seawater has appro ...

in turn to rock the ship to widen the channel. Her reciprocating steam engines are the most powerful functioning ones in

. She was the country's first large icebreaker, and was owned and used by the City of Stockholm to keep the channels around it clear of ice. She was also sometimes used outside the Stockholm area by the

Swedish government The Government of the Kingdom of Sweden ( sv, Konungariket Sveriges regering) is the national cabinet of Sweden, and the country's executive authority. The Government consists of the Prime Ministerappointed and dismissed by the Speaker of the R ...

since it had contributed towards her cost. She was renamed in 1958 during an extensive refit, which saw her converted from coal to oil, the

bridge A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...

was enclosed to protect the deck crew from the weather, and

radar Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...

and

radio Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmit ...

fitted.

References

Vasa museum

* ttp://www.miramarshipindex.org.nz/ship/list?IDNo=5311442&search_op=OR Miramar Ship Index - ''Isbrytaren II'' Museum ships in Sweden Icebreakers of Sweden 1915 ships Steamships of Sweden Ships built in Stockholm {{Icebreakers of Sweden