These were used in cranes and aboard ships in Ancient Greece, as well as in mines, water pumps and siege engines in Ancient Rome.

These were developments that had begun before the Industrial Revolution, but the adoption of James Watt's more efficient steam engine from the 1770s reduced the fuel costs of engines, making mines more profitable.

These had turbines, twelve 10. 5 cm guns as main armament, but were also equipped to carry and lay 100 mines.

These killing tunnels (" mines ") were at first collapsed to destroy targets located above, but they were later filled with explosives and detonated in order to cause greater devastation.

These odd sanctuaries have proven so popular and lucrative for ecotourism that efforts exist to prevent removal of the mines.

These facts pose serious difficulties in many developing nations where the presence of mines hampers resettlement, agriculture, and tourism.

These were used extensively in the copper mines at Rio Tinto in Spain, where one sequence comprised 16 such wheels arranged in pairs, and lifting water about.

These books detail many different mining methods used in German and Saxon mines.

These shared the profits of the silver mines in southern Iberia with the Barcas family and closely followed Hellenistic diplomatic customs.

These may be the first known mines.

These include narrow and standard gauge railways, coal and silver mines, shafts and its equipment from 19th and 20th century.

These were the forerunners of modern land mines.

These mines eject tripwires to act as booby traps, and when triggered are launched upward before exploding.

These subsequently decay into muons, which are able to reach the surface of the Earth, and even penetrate for some distance into shallow mines.

These were used for pumping water out of the Cornish Tin mines, and therefore the efficiency and efficacy of the engines was an important factor in the amount of tin, and money, which could be extracted from a mine.

These Germans were invited by King Géza II of Hungary to develop towns, build mines, and cultivate the land of Transylvania at different stages between 1141 and 1162.

These mines reached their peaks during the 1880s and 1890 ’ s, when over 200 stamp mills crushed quartz ore brought in by hand cars on track from the mines.

These two deaths with the addition of January's Sago Mine disaster and the Aracoma Alma Mine disaster caused West Virginia Governor Joe Manchin to close all of West Virginia's mines in a " mine safety stand-down.

These mines were the primary employers well into the 1980s.

These mines averaged a daily output of 2, 000 tons.

These layoffs led to a labor strike by the Knights of Labor which shut down the mines.

These included his walks on the Brocken and his visit to the mines in Rammelsberg.

These mining operations generally focused on discovering either lead or silver ore ; the company appointed Philip Francois Renault as commander of the mines, and in 1723 Boisbriand ceded land to Renault in Washington County ( in an area now known as the Old Mines ) and in the Mine La Motte area.

These estimates indicated that the quantum yield for the exchange of chlorine with liquid carbon tetrachloride at 65-degrees is of the order of magnitude of unity.

These localities continue to yield new organisms faster than they can be studied.

These cattle have a muscle yield of about 20 % more on average than cattle without the genetic myostatin mutation.

( These two identities are often combined, e. g. added or subtracted, to yield various other relations.

These methods yield only probabilities.

These investigations and results of Whipple's gave Minot and Murphy the idea that an experiment could be made to see whether favorable results might also be obtained in the case of pernicious anemia ... by making use of the foods of the kind that Whipple had found to yield favorable results in his experiments regarding anemia from loss of blood.

These estimates are important for engineers and economists so that proper risk analysis can be performed to influence investment decisions in future infrastructure and to determine the yield reliability characteristics of water supply systems.

These assumptions, the cornerstones of the Bohr model, were not fully correct but did yield the correct energy answers.

These improvements yield a rough doubling in ALU performance over the 386 at the same clock rate.

These higher-order averages are more difficult to measure, but can yield additional information about molecular ordering.

These ATP yields are theoretical maximum values ; in practice, some protons leak across the membrane, lowering the yield of ATP.

These solutions yield good rational approximations of the form x / y to the square root of n. In Cartesian coordinates, the equation has the form of a hyperbola ; it can be seen that solutions occur where the curve has integral ( x, y ) coordinates.

These clones yield more than 2, 000 kilograms of dry rubber per hectare per year, when grown under ideal conditions and ideal field.

These volatile chemicals yield important performance characteristics, primarily density reduction, cushioning / energy absorption and thermal insulation.

These particles may be quickly drawn up into the stratosphere, particularly if the explosive yield exceeds 10 kt.

These hybridized glasses have a very low level of optical dispersion ; only two compiled lenses made of these substances can yield a high level of correction.

These newer agents effectively suppress the immune system in the affected area, and appear to yield better results in some populations.

These equations are parametric in d. Setting d equal to any non-zero number and substituting it into these equations will yield one solution set.

These characters were later embellished and stylized to yield the seal script, which represents the oldest form of Chinese characters still in modern use.

These changes would reduce the explosive power ( yield ) of the weapon somewhat.

These operators operate on one or more relations to yield a relation.

These pegmatite mines and quarries yield more than 100 different minerals, including minerals containing Rare earth elements, beryllium, scandium, uranium, and thorium.

These references comprise the National Airspace System's method of allowing air traffic to select routes that yield efficient point to point navigation.

These insensitive papers are suitable for contact printing, and yield warm toned images by development.