Although there are cross-over boat types that blur this definition, rafts are usually kept afloat by using any combination of buoyant materials such as wood, sealed barrels, or inflated air chambers ( such as pontoons ), and are typically not propelled by an engine.

Although deemed satisfactory, the War Department planning group considered other U. S. Air Service military aircraft both in service and production, with a view that a dedicated design that could be fitted with interchangeable landing gear, wheeled and pontoons for water landings, would be preferable.

Although the form declined in popularity towards the end of the 18th century its influence can be seen in light operas like that of Gilbert and Sullivan's early works like The Sorcerer as well as in the modern musical.

Although he initially declined the part of Dr. David Banner in The Incredible Hulk because of its comic book origins, on reading Kenneth Johnson's script for the pilot episode, he was persuaded to change his mind ( and agreed to remain involved with the series for as long as Johnson was to be involved ).

Although production was usually about 57, 000 – 59, 000 tons annually in the 1980s, the acreage harvested declined from in the early 1980s to in 1999, indicating a greater yield per acre.

Although his text is predominantly negative, it neither exclusively condemns nor praises Domitian, and asserts that his rule started well, but gradually declined into terror.

Although his stature as a director had declined during the 1950s, his films underwent a revival in the 1960s:

Although the Privy Council declined after the death of Elizabeth, while she was alive it was very effective.

Although it was the primary language since colonial rule, Italian greatly declined under the rule of Muammar Gaddafi, who expelled the Italian Libyan population and made Arabic became the sole official language of the country.

Although Tirpitz had succeeded in getting more ships, the proportion of military expenditure on the navy declined in 1912 and thereafter, from 35 % in 1911 to 33 % in 1912 and 25 % in 1913.

Although the 1770s was one of the society's richest eras in terms of its collaborative achievements, the society's meetings declined from regular occurrences in 1775 to infrequent ones by the end of the decade.

Although Ibn Mu ' ammar declined to do so, Ibn ʿAbd al-Wahhab was still forced to leave.

Although such violence declined over the twentieth century, the religion's unique doctrinal views and practices still generate criticism, sometimes vehemently so.

Although industry was becoming more visible in Paraguay in the 1980s, industry's share of GDP actually declined in the 1970s and 1980s because of more rapid growth in agriculture.

Although he continued to be extremely popular and widely read, both at home and abroad, Scott's critical reputation declined in the last half of the nineteenth century as serious writers turned from romanticism to realism, and Scott began to be regarded as an author suitable for children.

Although the government sponsorship of shrines declined, Japanese nationalism remained closely linked to the legends of foundation and emperors, as developed by the kokugaku scholars.

Although initially willing to stand in the 1984 elections, the UNO, headed by Arturo Cruz ( a former Sandinista ) declined participation in the elections based on their own objections to the restrictions placed on the electoral process by the State of Emergency and the official advisement of President Ronald Reagan's State Department, who feared that their participation would legitimize the election process.

Although the amount of vermouth used in cocktail recipes has somewhat declined, it is still used today as an ingredient in many popular cocktails, and for that reason demand for the beverage has remained fairly steady through the 20th and into the 21st centuries.

Although the XFL began with better-than-expected TV ratings ( the opening-week games actually delivered ratings double those of what NBC had promised advertisers and the Saturday broadcast had more viewers than the NFL Pro Bowl ) and fair publicity, the audience declined sharply after the first week of the season, going from a 9. 5 rating to a 4. 6 in just one week, and the media attacked the league for what was perceived as a poor quality of play.

Although the presence of street children was a problem in Bucharest in the 1990s, their numbers have declined significantly in recent years, currently lying at or below the average of major European capital cities.

Although Rita remained in the cast, Anthony Booth declined to return.

Although much declined in recent years, the industry is still a significant employer in the area, with Brintons Carpets still employing several hundred people and is one of the biggest employers in the town.

Although Daley and Taylor declined at first, at Partee's insistence, Washington was slated for the seat and received the party's support.

Although the series was still drawing large audiences, after " White Ghost " Coltrane declined to return as Fitz unless McGovern returned to write the series.

Although the consumption of hake and other fish has declined in Spain during the last decade, hake still accounts for about 1 / 3 of the total fish consumed in Spain.

Although manufacturing has declined, a substantial base has remained in apparel and niche manufacturing concerns such as furniture, fabricated metals, and food products.

Although Howard was offered an appointment as the Secretary of War in the administration of President George Washington, he declined it.

Although Mr. Brown was not himself its inventor ( it was a French idea ), it is typical that his intuition first conceived the importance of mass producing this basic tool for general use.

Although the axiom of countable choice in particular is commonly used in constructive mathematics, its use has also been questioned.

Although Dirac did not himself use the term antimatter, its use follows on naturally enough from antielectrons, antiprotons, etc.

Although when burned, amber does give off a characteristic " pinewood " fragrance, modern products, such as perfume, do not normally use actual amber.

Although originating in the mainland of Greece, use of the acropolis model quickly spread to Greek colonies such as the Dorian Lato on Crete during the Archaic Period.

Although there were low levels of preexisting antibiotic-resistant bacteria before the widespread use of antibiotics, evolutionary pressure from their use has played a role in the development of muiltidrug resistance varieties and the spread of resistance between bacterial species.

Although cheap and effective in enabling use of some software that only used official ROM entry points for text output, this solution proved very slow because the Electron had to be placed into an 80-byte-pitch display to be able to get anywhere near to reproducing mode 7 and the CPU spent a lot of time drawing approximations of mode 7 characters and graphics that in a hardware solution would be achieved without any CPU processing.

Although there have been periodic initiatives to revive their use, airships have seen only niche application since that time.

Although such a conversion can be prone to loss, most modern audio systems use this approach as the techniques of digital signal processing are much more powerful and efficient than analog domain signal processing.

Although a number of different broadcast television systems were in use worldwide, the same principles of operation apply.

Although they are generally classified as a cappella metal, the band also includes a drummer, and use amplifiers on some songs to distort the voice to sound more like a real guitar.

Although local police were surprised by the size of N30, law enforcement agencies have since reacted worldwide to prevent the disruption of future events by a variety of tactics, including sheer weight of numbers, infiltrating the groups to determine their plans, and preparations for the use of force to remove protesters.

Although forms of brass have been in use since prehistory, its true nature as a copper-zinc alloy was not understood until the post medieval period because the zinc vapor which reacted with copper to make brass was not recognised as a metal.

Although he assumed use of his stepfather's surname, it was not until Billy ( as he was known then ) turned fifteen that he formally adopted the surname Clinton as a gesture toward his stepfather.

Although trade unions in Benin represent up to 75 % of the formal workforce, the large informal economy has been noted by the International Trade Union Confederation ( ITCU ) to contain ongoing problems, including a lack of women's wage equality, the use of child labour, and the continuing issue of forced labour.

Although a Conservative, Disraeli was sympathetic to some of the demands of the Chartists and argued for an alliance between the landed aristocracy and the working class against the increasing power of the merchants and new industrialists in the middle class, helping to found the Young England group in 1842 to promote the view that the landed interests should use their power to protect the poor from exploitation by middle-class businessmen.

Although the use of aircraft has for the most part always been used as a supplement to land or naval engagements, since their first major military use in World War I aircraft have increasingly taken on larger roles in warfare.

Although the holiday may use features of the Gaelic Beltane, such as the bonfire, it is more alike the Germanic May Day festival, both in its significance ( focusing on fertility ) and its rituals ( such as maypole dancing ).

Although players usually use their sticks to move the ball around, they may use any part of their bodies other than their heads, hands or arms and may use their skates in a limited manner.

Although the process of fermentation was not fully understood until Pasteur's work in 1857, it is still the first use of biotechnology to convert a food source into another form.