mast

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Related to Masts: mizzen, sail, spar

mast,

large metal or timber pole secured vertically or nearly vertically in a ship, used primarily for supporting sails and rigging. The mast is as old as sailing vessels, and the oldest sailboats depicted (those of ancient Egypt) had a small mast placed forward and carrying a single sail. The Phoenician bireme had one mast, the Greek trireme had two. Viking ships had one central mast. In the Middle Ages, a topmast was added, fixed to the single mast, to carry more sail; after the 16th cent., topmasts were generally demountable. By that time the building of larger vessels and the desire for greater speed on longer journeys had already brought increase in sails and in the masts—a process that continued until the clipper ships of the middle of the 19th cent. were rushed forward by clouds of sails. Above the topmast was added the topgallant mast and above that the topgallant mast royal. In vessels having more than one mast, a small forward mast is called the foremast and a small mast abaft the mainmast is called the mizzenmast. A platform for lookout on a mast is called a crow's nest. The modern merchant ship often has a mast made of hollow steel tubes, which is used mainly for signaling and for supporting radio antennas and lifts or derricks for cargo. In some modern warships the mast has a steel platform on which are mounted instruments for controlling gunfire.

Mast

 

(tower), a structure consisting of a pole or shaft steadied by guys. The pole is supported by a foundation, and the guys are fastened to anchors.

Masts are used most often as supports for radio, radio-relay, and television antennas and other communication structures. Foundations for poles and anchors may be made of cast-in-place plain concrete or reinforced concrete or built up from precast concrete elements; screw piles are also used. Masts are usually erected with the aid of a climbing crane moving along the pole. Light towers with heights up to 120 m are often assembled on the ground and erected with the aid of a derrick. Masts are designed for the least favorable combination of climatic (and sometimes seismic) loads and the loads imposed by the installed equipment.


Mast

 

a vertical metal or wood structure (spar) mounted on a deck in the longitudinal plane of symmetry of the vessel and used for furling the sails, supporting the derricks (masting sheers), radio antennas, light signals, and flag signals. The lower end of the mast is called the mast heel (or foot of the mast) and the upper part of the mast is called the top, or head. The first mast from the bow of a vessel is called the foremast, the second the mainmast, and the mast nearest to the stern the mizzenmast.

mast

[mast]
(engineering)
A vertical metal pole serving as an antenna or antenna support.
A slender vertical pole which must be held in position by guy lines.
A drill, derrick, or tripod mounted on a drill unit, which can be raised to operating position by mechanical means.
A single pole, used as a drill derrick, supported in its upright or operating position by guys.
(mechanical engineering)
A support member on certain industrial trucks, such as a forklift, that provides guideways for the vertical movement of the carriage.
(naval architecture)
A long wooden or metal pole or spar, usually vertical, on the deck or keel of a ship, to support other spars which in turn support or are attached to sails, as well as derricks.

mast

1. A tower which carries one or more load lines.
2. The load-bearing component of a derrick, or the like.

mast

1
1. Nautical any vertical spar for supporting sails, rigging, flags, etc., above the deck of a vessel or any components of such a composite spar
2. Nautical a hearing conducted by the captain of a vessel into minor offences of the crew
3. before the mast Nautical as an apprentice seaman

mast

2
the fruit of forest trees, such as beech, oak, etc., used as food for pigs
References in periodicals archive ?
Arqiva said workers had been installing TV and radio antennae on the temporary mast so the temporary mast could take over broadcasting duties while the main tower was out of action.
With a pedigree dating back to 1917 when its predecessor became sole supplier to the Royal Navy, Pilkington Optronics (now Thales) initiated the development of its private-venture CM010 family of optronics masts, installing a demonstrator onboard the Senior Service's 'Trafalgar' class SSN in 1996 prior to the company's selection by BAE Systems in 2000 to equip the Royal Navy's new 'Astute' class SSNs with a dual CM010 optronics mast for the first three boats (out of a total class size of seven vessels).
"A national committee has been set up to follow up the masts issue and we are awaiting the names to be announced through a Royal Decree."
Councillor Majdi Al Nasheet said requests for phone masts should be studied by the council and the municipality before they are approved.
A selection of your comments left on our website, Twitter and Facebook pages PLANS for a new mast by mobile phone giant Vodafone have sparked outrage among Gosforth residents.
The fact is that Mast - a 33-year-old former Cottage Grove High School social studies teacher - twice has been found not guilty of criminal charges alleging he had illegal sexual encounters with underage girls.
But some councillors were particularly worried that this could mean a cluster of masts on one site.
Rugby mayor Bill Sewell, who stumbled upon the crossshaped ruins after the masts were demolished last year, said: "The Hillmorton masts hold a dear place in the hearts of many Rugby people.
Officers from South Wales Police were in attendance yesterday at a peaceful demonstration staged by more than 30 adults and children on the site of a planned O2 mast opposite the post office in Heol Llanishen Fach, Rhiwbina, Cardiff.
The Federal Aviation Administration has now been approached to determine whether alternative lighting would affect pilots' ability to see the masts. And a federal court has since ruled that the Federal Communications Commission--the organisation responsible for regulating the US communications industry--must now evaluate the potential adverse effects of masts on migratory birds, following lobbying by the American Bird Conservancy and Earthjustice.
In this study a behaviour of guyed mast with combined guys was undertaken to compare static response predictions for a proposed type of guyed masts.