Unreferenced date December 2009 Normal heights are heights above sea level , one of several types of height which are all computed slightly differently. Alternatives are orthometric height s and dynamic height s. The normalheight math H math of a point is computed from geopotential height geopotential numbers by dividing the point s geopotential number, i.e. its geopotential difference with that of sea level, by the average, normal gravity computed along the plumbline of the point. More precisely, along the ellipsoid al normal, averaging over the height range from 0 the ellipsoid to math H math the procedure is thus recursive. Normal heights are thus dependent upon the reference ellipsoid chosen. The Soviet Union and many other Eastern European countries have chosen a height system based on normal heights, determined by geodetic precise levelling. Normal gravity values are easy to compute and hypothesis free , i.e., one does not have to know, as one would for computing orthometric heights, the density of the Earth s crust around the plumbline. Normal heights figure prominently in the theory of the Earth s gravity field developed by the school of M.S. Molodenskii . The reference surface that normal heights are measured from is called the quasi geoid , a representation of mean sea level similar to the geoid and close to it, but lacking the physical interpretation of an equipotential surface. DEFAULTSORT NormalHeight Category Geodesy nl Hoogte geografie pl Wysoko normalna sv Normalh jd zh ... more details
otheruses Image Height demonstration diagram.png thumb right 200px A cuboid demonstrating the dimensions length , width , and heightHeight is the measurement of vertical distance , but has two meanings in common use. It can either indicate how tall something is, or how high up it is. For example The height of the building is 50 m or The height of the airplane is 10,000 m . When used to describe how high something like an airplane or mountain peak is from sea level , height is more often called altitude . Height is measured along the vertical y axis between a specified point and another point. Etymology Wiktionary high Wiktionary height English high is derived from Old English h ah ... Dimensional models define height as the third dimension , the other two being length and width ... at a 90 degree angle, then the height is measured along that line. Height can also refer to The Altitude ... see diagram in circular segment . In algebraic number theory, a height function is a measurement ... See Above mean sea level Although height is relative to a plane of reference, most measurements of height in the physical world are based upon a zero surface, known as sea level . Both altitude and elevation , two synonyms for height, are usually defined as the position of a point above the mean ... height from the surface of a reference ellipsoid, see geodetic system Vertical datum Geodetic system, vertical datum . Defining the height of geographic landmarks becomes a question of reference. For example ... height, altitude, and elevation are not synonyms. Usually, the altitude of an aircraft is measured from sea level, while its height is measured from ground level. Elevation is also measured from sea level, but is most often regarded as a property of the ground. Thus, elevation plus height can equal ... Altitude in aviation . In human culture Human height is one of the areas of study within anthropometry . While height variations within a population are largely Genetics genetic , height variations between ... more details
Wiktionarypar normalNormal may refer to Normality behavior , conformance to an average Norm sociology , social norms, expected patterns of behavior studied within the context of sociology Normal distribution mathematics , the Gaussian continuous probability distribution Normal number , a number with a uniform distribution of digits Surface normal mathematics , a vector perpendicular to a surface normal vector Norm, a statistical concept in psychometrics Normal 2003 film Normal album Normal , a 2005 album by Ron Bumblefoot Thal Normal, Illinois Normality chemistry Normal concentration disambig da Normal de Normal Begriffskl rung es Normal fr Normal id Normal it Normale hu Norm lis egy rtelm s t lap nl Normaal ja no Normal pt Normal fi Normaali sv Normal vo Normal ... more details
Infobox Album See Wikipedia WikiProject Albums Name This Is Normal Type studio Artist gusgus Cover gusgusthisisnormal.jpg Released April 26, 1999 Recorded Genre techno music techno soul music soul , house music house , trip hop , dance music dance Length 53 35 Label 4AD Records 4AD Producer Reviews Allmusic Rating 4 5 Allmusic class album id r403544 pure url yes link Last album Polydistortion 1997 This album This Is Normal 1999 Next album Gus Gus vs. T World 2000 This Is Normal is the third album by Iceland ic group Gus Gus . It was released in 1999 on 4AD Records . Track listing Ladyshave 3 57 Teenage Sensation 4 14 Starlovers 4 43 Superhuman 6 20 Very Important People 5 51 Bambi 3 47 Snoozer 4 01 Blue Mug 4 11 Acid Milk 6 43 Love Vs. Hate 4 33 Dominique 5 15 Category 1999 albums Category GusGus albums fr This is Normal is This Is Normal GusGus plata pl This Is Normal ... more details
Infobox musical artist name The Normal background group or band image The normal.jpg origin years active Start date 1978 End date 1979 instrument Korg 700s genre alias past members Daniel Miller music producer Daniel Miller associated acts Robert Rental label Mute Records br Rough Trade Records Rough Trade br Sire Records Sire Warner Bros. Records The Normal is the recording artist name used by English music producer Daniel Miller music producer Daniel Miller , a film editor at the time, who is best known as the founder of the record label Mute Records . Background In 1977, Miller had split up with his girlfriend. A friend suggested that he read a book he himself had just finished. The book was Crash 1973 novel Crash 1973 by J.G. Ballard . ref name brit Synth Britannia Documentary BBC4 2 August 2010 ref He felt that Ballard s writing took him five minutes into the future the novel was to be a major influence in the music he would produce as The Normal. ref name brit Miller was disillusioned ... recorded and released a single under the name The Normal . This was T.V.O.D. Warm Leatherette . Both ... at West Runton Pavilion , The Normal s second release, done with another Mute Records act, Robert ... Rough 017. Influence on other artists Songs by The Normal have been covered and performed by many ... ref in support of their album Red Carpet Massacre . Discography The Normal T.V.O.D. Warm Leatherette Mute Records 1978 Robert Rental & The Normal Live At West Runton Pavilion, 6 3 79 Rough Trade Records ...?id 27895 The Normal at Mute Records Official site Allmusic class artist id p173473 http www.discogs.com artist Normal 2C The The Normal Discography at discogs.com Persondata Metadata see Wikipedia Persondata . NAME Normal, The ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Normal, The Category English New Wave musicians Category English electronic musicians Category Mute Records artists Category Sire Records artists de The Normal es ... more details
Dynamic height is a way of specifying the height of a point above a reference, as opposed to orthometric height or normalheight . Dynamic height is constant if one follows the same gravity potential as they move from place to place. Because of variations in gravity, surfaces having a constant difference in dynamic height may be closer or further apart in various places. Dynamic heights are usually chosen so that zero corresponds to the geoid. When optical leveling is done, the path corresponds closely to following a value of dynamic height horizontally, but to orthometric height for vertical changes measured on the leveling rod. Thus small corrections must be applied to field measurements to obtain the orthometric height usually used in engineering. US National Geodetic Survey data sheets ref http www.ngs.noaa.gov ref give both dynamic and orthometric values. References Reflist Category Geodesy ... more details
Refimprove date December 2009 The orthometric height is the distance H along a line of force from a given point P at the physical surface of an object to the geoid . Orthometric heights are what are usually used in the US for ordinary engineering work. Values for measured points can be obtained from the National Geodetic Survey data sheets ref http www.ngs.noaa.gov ref . This data was gathered over many years by massive projects of precise optical leveling. Orthometric heights relate approximately to the height above sea level but the current NAVD88 datum is tied to a specific elevation at a chosen point rather than to any location s exact mean sea level. GPS measurements give ECEF earth centered coordinates , usually displayed as height above the reference ellipsoid , which cannot be related accurately to orthometric height above the geoid unless accurate gravity data is available for that location. NGS is undertaking the GRAV D program to obtain such data. ref http www.ngs.noaa.gov GRAV D ref Alternatives to orthometric height include dynamic height and normalheight . References Reflist DEFAULTSORT Orthometric Height Category Surveying Category Geodesy Physics stub kk pl Wysoko ortometryczna sv Ortometrisk h jd zh ... more details
Height is the measurement of vertical distance. Height may also refer to Height musician , a Baltimore hip hop artist Height ring theory , a measurement in commutative algebra Height of a polynomial , the maximum of the magnitudes of a polynomial s coefficients Height function , a function in Diophantine geometry N ron Tate height , the height of a point on an abelian variety Altitude triangle , the height of a triangle Height John Nolan album People Dorothy Height 1912 2010 , civil rights activist See also Human height disamb de Height ... more details
height is out of the normal range in ways that would be unseemly if directed at skin color or weight ... heightheight . In principle it can refer to treatment of either unusually tall or short people ... of shortness in everyday life height and heightism in American society Toward a sociology ..., Saul. The presentation of shortness in everyday life height and heightism in American society Toward ... height of convert 34 to 40 in cm . ref name AFROTC http www.afrotc.com admissions medicalReq.php U.S. Air Force ROTC Admissions requirements ref Conversely certain professions have upper height ... needed date November 2011 These exceptions noted, in the great majority of cases a person s height ... executive officer CEO height in 2005 revealed that they were on average height ft 6 tall, which is approximately convert 2.5 in cm taller than the average American man. 30 were height ft 6 in 2 tall or more in comparison only 3.9 of the overall United States population is of this height. ref name FedBank ... uncovered that less than 3 of CEOs were below height ft 5 in 7 in height. Ninety percent of CEOs are of above average height. ref name Jonathan Rauch http www.jonathanrauch.com jrauch articles height ... a factor in dating preferences. For some people, height is a Physical attractiveness Height noteworthy ... t Want No Short, Short Man The Study Of Height, Power, and Mate Selection . ref ref name FA http www.findarticles.com ... between height and offspring count. ref name correlate http www.epjournal.net filestore EP06369385.pdf ... 2011 05 Sorokowski Adaptive preferences for leg length in a potential partner.pdf height and occupational ... height and occupational success evolutionary&hl en&gl us&pid bl&srcid ADGEESg6EYN1yttQPQbBwLLz8tPj ... relating Human heightHeight and physiological and psychological health height to human health ... society , a sociological relationship between height and perceived attractiveness exists. This cultural ... for tall men, with a large percentage indicating that a man significantly below average height was unacceptable ... more details
For someone seated, the popliteal height is the distance from the underside of the foot to the underside of the thigh at the knees . ref name meachan http personal.cityu.edu.hk meachan Online 20Anthropometry Chapter2 Ch2 16.htm ref It is sometimes called the stool height . The term sitting height is reserved for the height to the top of the head when seated. . This height greatly varies between ethnic groups For United Kingdom British people the median popliteal height is 400 millimetres for women, and 440 mm for men, while Japanese people Japanese men have a popliteal height of 400mm and women 360mm. ref name meachan References reflist External links measurement stub Category Anthropometry ... more details
File GaugeHeightVernier Electronic.jpg thumb The left height gauge has the vernier scale, while the right one is an electronic height gauge with a digital readout. File Height gauge in measurement.jpg thumb Height gauge with dial indicator tip in measurement process Unreferenced date May 2009 A height gauge is a measuring device used either for determining the height of something, or for repetitious marking of items to be worked on. The former type of height gauge is often used in doctor s surgeries to find the height of people. These measuring tools are used in metalworking or metrology to either set or measure vertical distances the pointer is sharpened to allow it to act as a scriber and assist in marking out work pieces. They may also be used to measure the height of an object by using the underside of the scriber as the datum. The datum may be permanently fixed or the height gauge may have provision to adjust the scale, this is done by sliding the scale vertically along the body of the height gauge by turning a fine feed screw at the top of the gauge then with the scriber set to the same level as the base, the scale can be matched to it. This adjustment allows different scribers or probes to be used, as well as adjusting for any errors in a damaged or resharpened probe. Types There are two types of height gauges Vernier height gauges and electronic height gauges . The vernier height gauge has the additional refinement of a vernier scale for greater accuracy in reading or setting the tool. The electronic height gauge has a digital readout that gives the height. gallery Image VernierHeightGauge CloseUpAdj.jpg Vernier height gauge adjusters, close up view Image VernierHeightGauge CloseUp.jpg Vernier height gauge, close up view Image VernierHeightGauge ElectronicCloseUp.jpg Electronic height gauge, close up view gallery See also Caliper Coordinate mapping Metalworking ... de altura con vernier id Height gauge nl Krasblok ja ru uk ... more details
whole unit. For example, a browser calculating an x height of 45 on a font 10 pixels tall may round ... Small caps Typographic unit External links http typophile.com wiki X height Definition of x height at typophile.com Typography terms DEFAULTSORT X Height Category Typography Link GA ca ca Altura de ... more details
Image Typography Line Terms.svg right 410px In typography , cap height refers to the height of a capital letter above the Baseline typography baseline for a particular typeface . ref http pfaedit.sourceforge.net glossary.html Glossary of some Typographic Terms ref It specifically refers to the height of capital letters that are flat such as H or I as opposed to round letters such as O , or pointed letters like A , both of which may display overshoot typography overshoot . The height of the small letters is referred to as x height . See also Overshoot typography Overshoot References reflist External links Typography terms typ stub Category Typography ... more details
Height of curvature in the tooth can be defined as the line encircling a tooth at its greatest bulge to a selected path of insertion. Locations of height of curvature For the outer surfaces of all teeth, the height of curvature is located in the cervical third of the teeth. In the inner surfaces of anterior teeth , both upper & lower teeth, the height of curvature is also located in the cervical third of the tooth. In the posterior teeth , both in upper and lower jaw, the height of contour is found at the middle third of the inner surface of the tooth. The lower second premolar proposes an exception as its height of curvature in inner surface is located in the Occlusion dentistry occlusal third of the inner surface. Functions The height of contours have great functions to mouth oral cavity They allow the food to be deflected allowing proper degree of massage to the gingiva . They prevent the food of being accumlated at the tooth. Holding the gingiva under definite tension. Mal developed height of curvature In case of under developed curvature, gingival recession may result. In case of over developed curvature, food will accumlate and there will be no massage to the gingiva and chronic inflammation may result. Unreferenced date December 2009 Category Dentistry definitions ... more details
Height Modernization is the name of a series of state by state programs recently begun by the United States National Geodetic Survey , a division of the National Oceanic and Atmospheric Administration . The goal of each state program is to place global positioning satellite GPS base stations at various locations within each participating state to measure topographic changes in the directions of latitude and longitude caused by subsidence or earthquakes , as well as to measure changes in height elevation . http agic.az.gov hm Arizona Height Modernization Arizona Geographic Information Council http tsrc.tamucc.edu TSRC HomePage Texas Height Modernization Texas A&M University Corpus Christi Category Geodesy science stub ... more details
A Height Ridge is the natural extension of a local maxima minima to 1D. Since a local min max was only a zero dimensional points, a height ridge is a one dimensional line. See Ridge detection on how to find height ridges. References reflist After listing your sources please cite them using inline citations and place them after the information they cite. Please see http en.wikipedia.org wiki Wikipedia REFB for instructions on how to add citations. Peikert et al, How to compute height ridges for visualization http graphics.ethz.ch peikert papers pacificVis08.pdf Category Image processing Category Computer vision ... more details
Unreferenced stub auto yes date December 2009 Orphan date December 2009 On a nautical chart , the drying height is the vertical distance of the seabed that is exposed by the tide , above the level of the sea at the lowest astronomical tide . On admiralty chart s a drying height is distinguished from a depth by being underlined. DEFAULTSORT Drying Height Category Cartography Geo term stub ... more details
Height channels are audio channels in surround sound multichannel audio . Height channels are located above the listening area and increase the sound field beyond the horizontal plane. Two systems that use height channels, Dolby Pro Logic Dolby Pro Logic IIz Dolby Pro Logic IIz and DTS sound system DTS Neo X DTS Neo X , which matrixes a front left and front right height out of the front left and front right channels. According to Dolby, non directional ambient effects such as rain and wind are mapped to the height channels. ref http www.dolby.com consumer understand playback dolby pro logic iiz details.html ref This is similar to what is mapped to rear surround channels . DTS HD is a format which supports virtually any amount over 2000 discrete channels for which a demonstration of an 11.2 system using four height channels was given at a Consumer Electronics Show . ref http www.hemagazine.com Dolby Pro Logic IIz vs Audyssey DSX?page 0 2C3 ref Tomlinson Holman s 10.2 surround sound, a format currently under development, uses 12 or 14 fully discrete channels, both including two height channels front left and front right. References reflist Category Surround sound Category Film sound production ... more details
Infobox person name Dorothy I. Height aspect ratio .807 image DrDorothyHeight.jpg birth name Dorothy Irene Height birth date Birth date 1912 3 24 mf y birth place Richmond, Virginia , United States U.S. ... U.S. occupation Educator and social activist Dorothy Irene Height March 24, 1912 &ndash April 20, 2010 ... Height Dies at 98 91581204.html title Civil Rights Icon Dorothy Height Dies at 98 date 2010 04 20 accessdate ... in 1994, and the Congressional Gold Medal in 2004. ref name nbc Early life Height was born in Richmond ... town in the suburbs of Pittsburgh . Height was admitted to Barnard College in 1929, but upon arrival ... year. ref cite news title Dorothy Height was educator and activist organizer publisher Post Tribune date 2003 02 16 accessdate 2010 04 20 page A2 ref Career Height started working as a caseworker ... cite book title Open Wide the Freedom Gates A Memoir year 2003 author Height, Dorothy location New ... and ecumenical education programs. ref name memoir In 1957, Height was named president of the National Council of Negro Women, a position she held until 1997. During the height of the American Civil Rights Movement 1955&ndash 1968 civil rights movement of the 1960s, Height organized Wednesdays in Mississippi , ref name AP cite web title Dorothy Height, civil rights activist, dies at 98 publisher ... took her counsel, including First Lady Eleanor Roosevelt , and Height also encouraged President ... to appoint African American women to positions in government. In the mid 1960s, Height wrote ... and her first column appeared in the March 20, 1965 issue on page 8. this is a full citation Height ... on the Status of Women. In 1974, Height was named to the National Council for the Protection of Human ... life Image Dorothy I. Height Building.JPG thumb The Dorothy I. Height Building , headquarters of the National Council of Negro Women , located on Pennsylvania Avenue in Washington, D.C. In 2004, Height ... Roosevelt . Height was the chairperson of the Executive Committee of the Leadership Conference ... more details
Bob Height was an African American blackface minstrel show minstrel performer. He was a standout talent in the companies with which he performed, although frustrations eventually drove him to pursue a career in Europe. Later writers have compared him to his contemporary, Bert Williams . ref Toll 203. ref Height joined with Charles Hicks in the late 1860s to form Hicks and Height s Georgia Minstrels . This company proved quite popular among African Americans, particularly in the Washington, D.C. area. Eventually, both Hicks and Height joined Sam Hague Sam Hague s Sam Hague s Slave Troupe of Georgia Minstrels Slave Troupe of Georgia Minstrels . Height became a featured talent and accompanied the troupe on a European tour in the early 1870s. Upon the troupe s return to the US in 1872, Charles Callender purchased it and changed the name to Callender s Original Georgia Minstrels . The new owner helped lead the company to great success, and Height enjoyed high billing alongside Billy Kersands and Pete Devonear . Before long, however, Height and several other performers quit Callender s in a dispute over pay and recognition. They formed a new company, but it saw little success most of the players soon rejoined Callender s troupe. Height instead emigrated to Europe, where he performed for many years. Notes references References Toll, Robert C. 1974 . Blacking Up The Minstrel Show in Nineteenth century America . New York Oxford University Press. Watkins, Mel 1994 . On the Real Side Laughing, Lying, and Signifying The Underground Tradition of African American Humor that Transformed American Culture, from Slavery to Richard Pryor . New York Simon & Schuster. Persondata Metadata see Wikipedia Persondata . NAME Height, Bob ALTERNATIVE NAMES SHORT DESCRIPTION African American comedian and dancer DATE OF BIRTH PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Height, Bob Category African American comedians Category American comedians Category American dancers Category American ... more details
Geopotential height is a vertical coordinate referenced to Earth s mean sea level an adjustment to geometric height elevation above mean sea level using the variation of gravity with latitude and elevation. Thus it can be considered a gravity adjusted height . One usually speaks of the geopotential height of a certain pressure level , which would correspond to the geopotential height necessary to reach the given atmospheric pressure pressure . At an elevation of math h math , the geopotential is defined as math Phi h int 0 h g phi,z ,dz , , math where math g phi,z math is the acceleration due to gravity, math phi math is latitude, and math z math is the geometric elevation. Thus, it is the gravitational potential energy per unit mass at that level. The geopotential height is math Z g h frac Phi h g 0 , , math where math g 0 math is the standard gravity at mean sea level. Geophysics Geophysical scientists often use geopotential height rather than geometric height, because doing so in many cases makes analytical calculations more convenient. For example, the primitive equations which numerical weather prediction weather forecast models solve are more easily expressed in terms of geopotential than geometric height. Using the former eliminates centrifugal force and air density which is very difficult to measure in the equations. A plot of geopotential height for a single pressure level shows the troughs and ridges, high pressure area Highs and low pressure area Lows , which are typically seen on upper air charts. The geopotential thickness between pressure levels difference of the 850 Pascal unit hPa and 1000 hPa geopotential heights for example is proportional to mean virtual temperature in that layer. Geopotential height contours can be used to calculate the geostrophic wind , which is faster where the contours are more closely spaced and tangential to the geopotential height contours. See also Above mean sea level References Hofmann Wellenhof, B. and Moritz, H. Physical ... more details
Image MVAFS 1973 Radar 2.jpg thumb right 220px center Mill Valley Air Force Station Mill Valley AFS height finder radar using Fan beam antenna 1973 center A height finder is a ground based aircraft altitude measuring device. Early height finder implementations were optical devices and later migrated to radar devices. Devices combining both optics and radar were deployed by the U.S. Military. ref cite web url http www.history.navy.mil library online radar 6.htm title Anti Aircraft Fire Control Sets publisher Department Of The Navy Naval Historical Center accessdate 2007 08 04 ref Optical In World War II, a height finder was an Coincidence rangefinder optical rangefinder used to determine the altitude of an aircraft actually the slant range from the emplacement which was combined with the angle of sight, in a mechanical computer, to produce altitude , used to direct anti aircraft guns. ref http www.hnsa.org doc br224 part4.htm par415 The Gunnery Pocket Book, paragraph 428. ref ref name hf us m2 cite web url http www.ftmac.org M2Project.htm title Status Update for the M2 Height Finder Project ... name hf us m2 and Japanese ref cite web url http www.lonesentry.com articles ttt japanese height finder artillery.html title Japanese Height Finder date December 2, 1943 work Tactical and Technical Trends ... a German and Russian version exist. citation needed date August 2007 Radar A height finder radar ... height indicator , then bisects the target with a cursor that is scaled to indicate the approximate ... picture. citation needed date August 2007 Height finding radars of the 1960s and 70s were distinguished by their antenna being tall, but narrow. As beam shape is a function of antenna shape, the height ... radar sets have 3 dimensional capability making height finder radars largely obsolete. citation ... S 200 A page about a type of height finders found in surface to air missile sites German ru ? DEFAULTSORT Height Finder Category Radar mil aviation stub tech stub de H henfinder fr Radar de ... more details
Refimprove date February 2009 Nofootnotes date February 2009 The cloud height or the height of the cloud is the distance between the cloud base and the cloud top . It is traditionally expressed either in metres or as a pressure difference in hectopascal hPa, equivalent to millibar . Sometimes, the expression cloud height is used instead of cloud base , in which case the context has to clarify whether the intent is to designate the elevation or the size of the cloud. Measurement Cloud height is not measured directly, but derived from separate measurements of cloud base and cloud top altitudes. Weather and climate relevance Cloud height is often related to the intensity of precipitation generated by a cloud deeper clouds tend to produce more intense rainfall. For instance, cumulonimbus cloud s can develop vertically through a substantial part of the troposphere and often result in thunderstorm s with lightning and heavy showers. By contrast, very thin clouds such as cirrus clouds do not generate any precipitation at the surface. For a synthetic discussion of the impact of clouds on the climate system, see the http www.grida.no climate ipcc tar wg1 index.htm IPCC Third Assessment Report , in particular chapter 7.2. See also Precipitation meteorology Precipitation Cloud cover References Huschke, Ralph E. 1959 Glossary of Meteorology , American Meteorological Society, Boston, Second printing 1970. Category Clouds meteorology stub no Skyh yde nn Skyh gd sv Molnh jd ... more details
The flying height or floating height or head gap is the distance between the disk read write head on a hard drive and the platter. The earliest hard disks had no flying height their heads were in contact with the media. Citation needed date September 2011 But in modern drives, the flying height is normally about 3 nanometer s. Thus, the head can collide with even an obstruction as thin as a fingerprint or a particle of smoke. Despite the dangers of hard drive failure from such foreign objects, hard drives generally allow for ventilation albeit through a filter so that the air pressure within the drive can equalize with the air pressure without. ref http www.pcguide.com ref hdd op heads op Height.htm ref Drive function depends on the head floating on an air bearing , or cushion of air, so it is not possible at this time to have the head simply operate in a vacuum. ref http www.acsdata.com how a hard drive works.htm ref Regulation of flying height will become even more important in future high capacity drives. ref http www.springerlink.com content 51643p3275700636 ref References reflist Category Hard disk drives ... more details
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