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See also:TURBINE (See also:Lat. turbo, a whirlwind, a whirling See also:motion ,or See also:object, a See also:top) , in See also:engineering, a See also:machine which applies the See also:energy of a See also:jet of See also:water or See also:steam to produce the rotation of a See also:shaft . It consists essentially of a See also:wheel or chamber provided with a number of See also:blades or vanes upon which the fluid jet impinges; the impelled fluid causes the blades to rotate and also the shaft to which they are attached . Water turbines are treated under See also:HYDRAULICS, and steam turbines under STEAM See also:ENGINE . TURBOT' (Rhombus See also:maximus or Psetta See also:maxima), one of the largest and most valuable of the See also:flat-fishes or Pleuronectidae . The turbot, which rarely exceeds a length of two feet, has See also:great width of See also:body, and is scaleless, but is covered with conical bony tubercles . The eyes are on the See also:left See also:side of the body, the See also:lower being slightly in advance of the upper; the mouth is large and armed with See also:teeth of uniformly See also:minute See also:size . The turbot is found all See also:round the coasts of See also:Europe (except in the extreme See also:north), preferring a flat sandy bottom with from to to 50 fathoms of water . The broad See also:banks off the Dutch See also:coast are a favourite resort . It is a voracious See also:fish, and feeds on other fish, crustaceans and molluscs . It seems to constantly See also:change its See also:abode, wandering northward during the summer, and going into deeper water in the See also:cold See also:season . The eggs of the turbot, like those of the See also:majority of flat-fishes, are pelagic and buoyant . They are small and very numerous, varying from five to ten millions in fish of 18 to 21 lb See also:weight . The See also:young fish are symmetrical and . swim ' The word " turbot " is of great antiquity, perhaps of See also:Celtic origin; it is preserved in See also:French in the same See also:form as in See also:English, and is composed of two words, of which the second is identical with the " but in See also:halibut and with the See also:German " See also:Butte," which signifies flat-fish . The German name for the turbot is " Steinbutte." vertically like the young of other Pleuronectids, but they reach a much larger size before See also:metamorphosis than See also:species of other genera, specimens from a in. to 1 in. in length being frequently taken See also:swimming at the See also:surface of the water and not completely converted into the adult See also:condition . Specimens one See also:year old are from 3 to 4 in. See also:long, some perhaps larger . About 186o it was estimated that the Dutch supplied turbot to the See also:London See also:market to the value of £8o;000 a year . In 1900 the See also:total weight of turbot landed on English and Welsh coasts for the year was according to the See also:Board of See also:Trade returns 60,715 cwt. valued at £252,680 . The turbot is also See also:common, though not abundant, in the Mediterranean, and is replaced in the See also:Black See also:Sea by an allied species with much larger bony tubercles (Rh. maeoticus) . Both species grow to a large size, being usually sold at from 5 to 10 lb; but the common turbot is stated to attain to a weight of 30 lb . |
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