wiktionary Compound may refer to Chemical compound s, combinations of two or more elements Compound enclosure , a cluster of buildings having a shared purpose, usually inside a fence or wall Compound fortification , a version of the above fortified with defensive structures Compound bow , a type of bow for archery Compound linguistics , a word that consists of more than one radical element Compound migrant labour , a hostel for migrant workers such as those historically connected with mines in South Africa Compound music , an attribute of an interval or time signature Compounding , the mixing of drugs in pharmacy Polyhedral compound , a polyhedron composed of multiple polyhedra sharing the same centre of attention Compond may also refer to Compound chocolate , a chocolate substitute Compound fracture , complete fractures of bone where at least one fragment has damaged the skin, soft tissue or surrounding body cavity Compound interest , unpaid interest that is added to the principal so that subsequent interest is calculated on the grossed amount Compound engine , a steam engine in which steam is expanded through a series of two or three cylinders before exhaust. Turbo compound engine , an internal combustion engine where exhaust gases expand through power turbine s Compound sentence linguistics , a type of sentence made up of two or more independent clauses and no subordinate dependent clauses See also Composite disambiguation disambiguation de Mischung eo Kompona o fr Composite fr Composition lt Junginys nl Composiet ja ru simple Compound uk ... more details
Compound S may refer to Cortodoxone Zidovudine , by trade name disambig Short pages monitor This long comment was added to the page to prevent it from being listed on Special Shortpages. It and the accompanying monitoring template were generated via Template Long comment. Please do not remove the monitor template without removing the comment as well. ... more details
. In response to complaints of illegal paintball games within the compound, the Palm Bay City Council ... Bay http oldpalmbay.com DEFAULTSORT Compound Category Palm Bay, Florida Category Geography of Brevard ... more details
wiktionary motionMotion may refer to Motion physics , any movement or change in position or place Motion legal , a procedural device in law to bring a limited, contested matter before a court Motion democracy , a formal step to introduce a matter for consideration by a group Motion parliamentary procedure , a formal proposal by a member of a deliberative assembly that the assembly take certain action Motion American football , a movement by an offensive player prior to the start of a play Motion, the connecting rods and valve gear of a Steam locomotive Running gear steam locomotive Graphics and software Motion conference , the annual conference on animation, motion graphics and visual effects Motion software , a motion graphics software application by Apple Computer, or a term for Motion graphics generally Motion surveillance software , a software motion detector surveillance system for Linux Music Motion The Cinematic Orchestra album Motion The Cinematic Orchestra album , 1999 Motion Lee Konitz album Motion Lee Konitz album , 1961 Motion The Mayfield Four EP Motion EP , a 1997 EP by The Mayfield Four Motion Eduardo Falaschi song Motion Eduardo Falaschi song , Eduardo Falaschi The Motions , a 2009 song by Matthew West Pete Nischt and the Motions , a band from Akron, Ohio People Andrew Motion born 1952 , English poet laureate See also Self motion disambiguation Move disambiguation lookfrom motion disambiguation ca Moviment desambiguaci de Bewegung es Movimiento fr Motion ro Motion dezambiguizare ... more details
In Motion may refer to In Motion Copeland album In Motion Joey Yung album In Motion song , a song by hide disambig Short pages monitor This long comment was added to the page to prevent it from being listed on Special Shortpages. It and the accompanying monitoring template were generated via Template Long comment. Please do not remove the monitor template without removing the comment as well. ... more details
Ref improve date December 2011 Infobox album See Wikipedia WikiProject Albums Name Into Motion Type Album Artist Salvador band Salvador Cover Released June 4, 2002 Recorded Genre Christian music , Christian pop , Christian rock Length Label Word Records Word Producer Reviews Last album Salvador Salvador album Salvador br 2000 This album Into Motion br 2002 Next album Con Poder Salvador album Con Poder br 2003 Into Motion is the second album released by Salvador band Salvador . The album reached 198 on the Billboard top 200. ref http www.billboard.com album salvador into motion 536243 album salvador into motion 536243 ref Track listing Breathing Life 3 37 City On A Hill 4 32 When I Pray 4 15 Can t Keep It In 3 12 Black Flower 5 03 God People 2 51 Alegria 2 24 Psalm 3 5 22 Salt & Light 4 48 Worthy 3 35 Mighty King Of Love 2 43 References reflist christian album stub Category 2002 albums Category Christian music albums Salvador albums ... more details
Compound meter may refer to Meter music Compound meter Compound meter music Compound meter water meter Disambig Long comment to avoid being listed on short pages ... more details
Infobox NRHP name Kennedy Compound nrhp type nhld image Kennedy compound nat park serv.jpg caption Main house of the Kennedy Compound 1972 . location 100 Marchant Avenue br Hyannis, Massachusetts Hyannis Port Hyannis Port, Massachusetts , United States U.S. lat degrees 41 lat minutes 37 lat seconds 47.928 lat direction N long degrees 70 long minutes 18 long seconds 8.4954 long direction W locmapin Massachusetts area 6 acre s 24,000 m built 1904 architect Unknown architecture Clapboard architecture clapboard designated nrhp type November 28, 1972 added November 28, 1972 governing body Private refnum 72001302 ref name nris NRISref 2007a ref The Kennedy Compound or Hyannis Port Historic District ... in 2009. John used the compound as a base for his United States presidential election, 1960 successful ... Edward Ted M. Kennedy that the compound could be transformed into an education center and museum. ref Staff writer August 27, 2009 . http www.foxnews.com politics 2009 08 27 kennedy compound converted museum Kennedy Compound to Be Converted to Museum Sen. Edward Kennedy Succumbed to Brain Cancer at the Compound ... that the Kennedy Compound would be donated to charity. History In 1926 Joseph rented a summer cottage ... F. Kennedy Robert and his wife Ethel in 1961. Edward lived in the compound until his death. ref name Cape Cod Times Berry cite news last Berry first Jake title Future of compound fueling rumor ... The compound also contains houses of non Kennedy members. Clarify date August 2009 this needs flushing ... his own house in the compound, the kitchen, and various pantry pantries and utility room s. ref name .... The house has a full attic . ref name nps.gov The basement contains a Movie theater motion picture ... prominent homes. References NPS article The Presidents Kennedy Compound url http www.cr.nps.gov ... presidents site30.htm The National Park Service s entry on the Kennedy Compound External links Cite .... Kennedy Category Kennedy family Compound Category National Historic Landmarks in Massachusetts Category ... more details
In linguistics , a compound is a lexeme less precisely, a word that consists of more than one Word stem stem . Compounding or composition is the word formation that creates compound lexemes the other word .... In other words, compound , compounding or word compounding occurs when a person attaches two or more ... of compounds Compound formation rules vary widely across language types. In a synthetic language , the relationship between the elements of a compound may be marked with a case or other morpheme. For example, the German language German compound Kapit nspatent consists of the lexemes Kapit n sea captain ... . Conversely, in the Hebrew language compound, the word bet sefer school , it is the head that is modified the compound literally means house of book , with bayit house having entered ... of the compound are marked. Agglutinative language s tend to create very long words with derivational ... language German , extremely extendable compound words can be found in the language of chemical compounds ... to the length of compound words, but in practice words consisting of more than three components are rare ..., Swedish. Motion estimation search range settings can be directly translated to r relseuppskattningss kintervallsinst llningar ... also dvandva appositional An endocentric compound consists of a head linguistics head , i.e. the categorical part that contains the basic meaning of the whole compound, and modifiers, which restrict this meaning. For example, the English compound doghouse , where house is the head and dog is the modifier ... tatpuru a in the Sanskrit tradition. Exocentric compounds called a bahuvrihi compound in the Sanskrit ..., the English compound white collar is neither a kind of collar nor a white thing. In an exocentric compound, the word class is determined lexically, disregarding the class of the constituents. For example, a must have is not a verb but a noun. The meaning of this type of compound can be glossed as one whose B is A , where B is the second element of the compound and A the first. A bahuvrihi ... more details
Compound option or split fee option ref http www.smartprofitsreport.com glossary caputoption.html Glossary of Option Terms Caput Option ref ref http www.amex.com servlet AmexFnDictionary?pageid display&titleid 5606 Split Fee Option ref is option on an option. The exercise payoff of a compound option involves the value of another option. A compound option then has two Expiration options expiration dates and two strike price s. Usually, compounded options are used for currency or fixed income markets where insecurity exists regarding the option s risk protection. Another common business application that compound options are used for to hedge bids for business projects that may or may not be accepted. Variants Compound options provide their owners with the right to buy or sell another option. These options create positions with greater leverage than do traditional options. There are four basic types of compound options ref http www.investopedia.com terms c compoundoption.asp Compound Option ref Call on Call CoC Call on Put CoP or caput option Put on Put PoP Put on Call PoC References Reflist External links http www.global derivatives.com index.php?option com content&task view&id 31&Itemid 31 Compound Options http www.pstat.ucsb.edu faculty fouque PubliFM compound.pdf Evaluation of compound options using perturbation approximation http www.montegodata.co.uk Consult Compound compound.htm COMPOUND OPTION Calculator Derivatives market Category Options ... more details
Unreferenced auto yes date December 2009 File Trisodium phosphate.png right thumb 100px Sodium phosphate , Na sub 3 sub PO sub 4 sub , is a ternary compound. In chemistry , a ternary compound is a compound containing three different elements. An example of this is sodium phosphate , Na sub 3 sub PO sub 4 sub . The sodium ion has a charge of 1 and the phosphate ion has a charge of 3 . Therefore, three sodium ions are needed to balance the charge of one phosphate ion. Another example of a ternary compound is calcium carbonate CaCO sub 3 sub . See also Binary compound DEFAULTSORT Ternary Compound Chemistry stub Category Chemical compounds ja ... more details
Unreferenced stub auto yes date December 2009 Orphan date December 2009 A generalized compound is a mixture of chemical compound s of constant composition, despite possible changes in the total amount. The concept is used in the Dynamic Energy Budget theory, where biomass is partitioned into a limited set of generalised compounds, which contain a high percentage of organic compound s. The amount of generalized compound can be quantified in terms of weight, but more conveniently in terms of C mole s.The concept of strong homeostasis has an intimate relationship with that of generalised compound. DEFAULTSORT Generalised Compound Category Metabolism Chemistry stub ... more details
Unreferenced date December 2009 Image Swedish protected compound sign.PNG thumb Swedish sign for an officially designated secure compound In military science , a compound is a type of fortification made up of walls or fences surrounding several buildings in the center of a large piece of land. The walls can either serve the purpose of being tall, thick, and impenetrable, in which case they would be made of wood, stone, or some other like substance or dangerous to attempt to scale, in which case they could be made of barbed wire or electrified. Compounds can be designed to double as living spaces and military structures in the middle of hostile territory or as a military area within a country s territory they are also used by the extremely wealthy, powerful, Paranoia paranoid or criminal to protect against threats to themselves or their property. A number of survivalist s own fortified compound like structures as a means of protection for when they perceive that civilization has broken down or that their government has become abusive. The term compound is also used to refer to an unfortified enclosure, especially in Africa and Asia . See compound enclosure . See also Stockade Boma enclosure Compound enclosure gated community DEFAULTSORT Compound Fortification Category Fortification by type it Compound nl Compound leefgemeenschap sv Skyddsobjekt ... more details
A compound turbine is a steam turbine in which there are two casings, a high pressure casing and a low pressure casing, operating in concert to extract work from a single source of steam. The steam is partially expanded in the high pressure casing, then exhausted to the low pressure casing. Tandem compound or cross compound The rotor arrangement can be either tandem compound in which the two axle s are joined end to end, or cross compound in which the two turbines have separate axles. In the cross compound case two separate generator device generators are usually supplied, although a gearbox can reduce this to one. Advantages The principal advantages of compound turbines are the reduction in size of any one casing, the confinement of the highest pressure to the smaller casing which may be made of stronger and more expensive materials and the possibility of divided flow in the low pressure casing for the purpose of equalizing end thrusts. See also Pressure compounding in turbines References Unreferenced date January 2008 Category Steam turbines mech engineering stub ... more details
Orphan date April 2011 Unreferenced date July 2009 A compound device is like an internal USB hub often implemented in software on the device , which allows various sub devices to connect. This arrangement is used by wireless receivers for Alphanumeric keyboard cordless keyboard s and Mouse computing mice where the mouse and keyboard are separate devices connected to the compound device and sometimes for computer printer printer s which have card slots. DEFAULTSORT Compound device Category Universal Serial Bus ... more details
unreferenced date November 2009 Compound when applied to a human habitat refers to a cluster of building s in an enclosure, having a shared or associated purpose, such as the houses of an extended family e.g. the Kennedy Compound for the Kennedy family . The enclosure disambiguation enclosure may be a wall , a fence , a hedge barrier hedge or some other structure, or it may be formed by the buildings themselves, when they are built around an open area or joined together. In the United Kingdom , compound is not generally used in the sense of an unfortified enclosure, and not for homes. There, as in North American English , if used for a place, it is most likely to be taken to mean a fortified Compound fortification military compound . The unfortified enclosure usage was developed by the British Empire in Asia and Africa . Now it has slightly different meanings among English speaking people in those continents In Asia it refers to a collection of business establishments or living quarters, especially those used by Europe ans. In Africa it used to mean a collection of workers houses, but is now used for any cluster of related or linked homes, especially residences for members of the same family or those working for the same employer, or those belonging to a farm, or the cluster of houses known in Africa as a Homestead small African settlement homestead . The term can also be applied to an establishment such as a school or business , as in the school compound or the factory compound . In the English language in Africa English dialects of some African countries , compound may refer to a much larger collection of dwellings, as a synonym for a homogeneous township or suburb comprising homes of similar character usually built as public housing projects, or for a shantytown . An example is Chawama Compound , Lusaka , Zambia. See also Compound fortification Boma enclosure Kraal Osama bin Laden s hideout compound Category Human habitats Category Fences ... more details
For pipe joint compound Pipe dope refimprove date April 2009 Image jointcompound.jpg thumb right 285px A bucket of joint compound File Drywall.jpg thumb right Drywall with joint compound applied. Joint compound also known as drywall compound is a white substance similar to plaster used to seal joints between sheets of drywall , primarily in building construction. It is often referred to simply as mud . Ready mix lightweight joint compound Ready mix lightweight joint compound is a pre made form of joint compound designed for fast application and easy maintenance. The compound is a complex combination of water , limestone , expanded perlite , ethylene vinyl acetate polymer and attapulgite . This delicate mixture of compounds gives it a very creamy texture which allows it to spread onto surface with great ease. Usage Ready mixed joint compound is most commonly used in hanging drywall for new .... When used for new walls, joint compound effectively eliminates all blemishes from the surface of the drywall, such as drilled in screws, hanging tape, or drywall tape. Joint compound can be used ..., tears, and other minor damages. Ready mix joint compound is usually more forgiving than the traditional form of joint compound. It can be used for as long of a period of time as needed, and does not dry up unless left unattended for a long period of time. Traditional mix it yourself joint compound ... referred to as drywall taping mud, joint compound is the primary material used in the drywall industry by a tradesperson , or applicator, called a taper or drywall taper. A similar compound is used ... been pre sealed and coated with joint compound. The flexibility and plastic qualities of joint compound ... and trowelled joint compound on gypsum panels is a standard construction technique for painted wall ..., it is best to apply topping compound for finish layer s that level and sand more evenly. Both ... compound mixes manufactured prior to the 1980s often contained a complex mixture of several substances ... more details
Orphan date January 2012 Compound 48 80 is a polymer produced by the condensation reaction condensation of N methyl p methoxyphenethylamine with formaldehyde . ref http www.sigmaaldrich.com catalog ProductDetail.do?N4 C2313 7CSIGMA&N5 SEARCH CONCAT PNO 7CBRAND KEY&F SPEC Compound48 80 at Sigma Aldrich ref It promotes histamine release. ref cite journal journal Br J Pharmacol year 1970 volume 38 issue 1 pages 253 262 title Mechanisms of histamine release by compound 48 80 author A. M. Rothschild pmid 4189829 pmc 1702640 ref In biochemical research, compound 48 80 is used to promote mast cell degranulation . References reflist Category Polymers biochem stub zh Compound 48 80 ... more details
about compound documents in general the W3C standard Compound Document Format confusing date September 2011 In computing , a compound document is a document type typically produced using word processor word processing software, and is a regular text document intermingled with non text elements such as spreadsheet s, picture s, digital video s, digital audio , and other multimedia features. It can also be used to collect several documents into one. Compound document technology technologies are commonly utilized on top of a software componentry framework, but the idea of software componentry includes several other concepts apart from compound documents, and software components alone do not enable compound documents. Well known technologies for compound documents include ActiveX Document s Bonobo computing Bonobo by Ximian primarily used by GNOME KPart s in KDE Object linking and embedding OLE by Microsoft Open Document Architecture from ITU T not used OpenDoc by Apple Computer now defunct http sourceforge.net projects verdantium Verdantium XML and Extensible Stylesheet Language XSL are encapsulation formats used for compound documents of all kinds Since many documents contain non text elements such as spreadsheet s, picture s, digital video s, digital audio , and other multimedia features is of critical importance to mitigate the risks of undetected and unapproved changes. Software based compound document comparison compares the entire document granularly, including the native format ... coding or highlighting the changes granularly. Compound document comparison can be used on any document ... based compound document comparison is held by Lit ra Technology LLC. ref Massand, Deepak, Assignee Lit ra Technology LLC, McLeansville, NC. 2006. Method of compound document comparison. U.S. Patent 7,818,660, filed January 2006, and issued October 19, 2010. ref While the origins of the compound document ... Transclusion Compound Document Comparison http www.litera.com products change pro.html dead link ... more details
A polyhedral compound is a polyhedron that is itself composed of several other polyhedra sharing a common centre. They are the three dimensional analogs of star polygon Star figures polygonal compound s such as the hexagram . Neighbouring vertices of a compound can be connected to form a convex polyhedron called the convex hull . The compound is a facetting of the convex hull. Another convex polyhedron is formed by the small central space common to all members of the compound. This polyhedron can be considered the core for a set of stellation s including this compound. See List of Wenninger polyhedron ... stellations. Regular compounds A regular polyhedron compound can be defined as a compound which ... group Symmetry Dual Compound of two tetrahedra , or stella octangula Image Compound of two tetrahedra.png 100px Cube geometry Cube Octahedron style text align center O sub h sub Self dual Compound of five tetrahedra , or chiro icosahedron Image Compound of five tetrahedra.png 100px Dodecahedron ... chiral twin Compound of ten tetrahedra , compound of two chiro icoshedra, or icosiicosahedron Image Compound of ten tetrahedra.png 100px Dodecahedron Icosahedron style text align center I sub h sub Self dual Compound of five cubes , or rhombihedron Image Compound of five cubes.png 100px Dodecahedron Rhombic triacontahedron style text align center I sub h sub Compound of five octahedra Compound of five octahedra , or small icosiicosahedron Image Compound of five octahedra.png 100px Icosidodecahedron Icosahedron style text align center I sub h sub Compound of five cubes Best known is the compound ... of the two an octahedron , which shares the same face planes as the compound. Thus it is a stellation ... be regarded as a Dual regular compounds dual regular compound . The compound of five tetrahedra comes in two chirality mathematics enantiomorph ic versions, which together make up the compound of 10 tetrahedra. Each of the tetrahedral compounds is self dual, and the compound of 5 cubes is dual to the compound ... more details
The term compound fruit is not used in technical botany botanical writing, but is sometimes used when it is not clear which of several fruit types is involved. A compound fruit is composed of two or more similar parts . ref cite book author Hickey, M. King, C. date 2001 title The Cambridge Illustrated Glossary of Botanical Terms publisher Cambridge University Press others translated by ref image Frambozenkever.jpg thumb left A raspberry is an aggregate fruit Image Pineapple and cross section.jpg thumb A pineapple is a multiple fruit. Image Kumato 02.jpg thumb A tomato is a simple fruit derived from a compound ovary. A compound fruit may be An aggregate fruit , in which one flower contains several separate ovaries, which merge together during development. A multiple fruit , in which several flowers, each with an ovary, develop into small fruits that are clustered or fused together into a larger fruit. A simple fruit formed from a Gynoecium Carpel morphology compound ovary . Grape s grow in clusters, but are not compound fruits. Each grape is grown from one ovary in one flower, and each grape remains an independent fruit. References reflist fruits Category fruit morphology ar cs Souplod de Sammelfrucht et Koguvili hi no Samfrukt pl Owoc zbiorowy ru sk S plodie sr sv Fruktf rband uk zh ... more details
in Compound Management for High Throughput Screening date 2004 12 01 volume 2 issue 6 pages ... often involved in fetching chemicals, and quality control of the storage environment is called Compound Management or Compound Control. Compound Management is often a significant expense, as well as career ... journal Drug Discovery World date Spring 2003 author Ian Yates title Compound Management Comes of Age pages 35&ndash 42 format PDF url http www.ddw online.com data pdfs compound 20management.pdf ref There are many books and journal articles devoted entirely or in part to compound management. ref cite book title Industrialization of Drug Discovery author Jeffrey S. Handen chapter Compound Management ... to be faced in the necessity of compound management, which are being surmounted by concerted efforts ... The challenge of compound management journal Modern Drug Discovery date January February 1999 ... compound management platform, in order to serve over 200,000 different compounds. ref cite journal author Adam Yasgar et al. title Compound Management for Quantitative High Throughput Screening journal ...?artid 2390859&blobtype pdf ref In short, Compound Management requires inventory control ... compounds contained in compound libraries can number in the millions, making compound management and compound control important contributors to research and drug discovery . Outsourcing Because of the significant expenses and infrastructure required for accurate compound management space ... significant experience in compound management due to the complexity of tracking not only inventory data, but also compound location, storage conditions, and compound integrity. This experience also ... conferences related to compound management. The best known is Compound Management & Integrity ref ... 20 20UK .htm Conference Compound Management & Integrity 2009 ref although many chemistry and pharmaceutical ... more details
Image Cyclopropane.png thumb 150px right Cyclopropane is the smallest alicyclic compound. An alicyclic compound is an organic compound that is both Aliphatic compound aliphatic and cyclic compound cyclic . They contain one or more all carbon rings which may be either saturation chemistry saturated or unsaturated, but do not have aromaticity aromatic character. ref GoldBookRef title Alicyclic compounds file A00216 year 1995 ref Alicyclic compounds may or may not have aliphatic side chains attached. The simplest alicyclic compounds are the monocyclic cycloalkane s cyclopropane , cyclobutane , cyclopentane , cyclohexane , cycloheptane , cyclooctane , cyclononane , cyclodecane , cycloundecane , cyclododecane , and so on. Bicyclic molecule Bicyclic alkanes include bicycloundecane and decalin . Polycyclic compound Polycyclic alkanes include cubane , basketane , and housane . Spiro compound s have two or more rings that are connected through only one carbon atom. An exocyclic group is always shown outside the ring structure, take for instance the exocyclic double bond on the left Image Exocyclic.png 200px Left exocyclic double bond Right regular double bond br style clear both See for an example isotoluene . The placement of double bonds in many alicyclic compounds can be predicted with Bredt s rule . The mode of ring closing in the formation of many alicyclic compounds can be predicted by Baldwin s rules . Cycloalkenes Image Cyclohexene structures.svg thumb right Cyclohexene is an alicyclic compound with a double bond. Monocyclic cycloalkene s are cyclopropene , cyclobutene , cyclopentene , cyclohexene , cycloheptene , cyclooctene , and so on. Bicyclic alkenes include norbornene and norbornadiene . References references Category Organic compounds Category Organic chemistry ar ca Compost alic clic cs Alicyklick slou eniny de Alicyclische Verbindungen et Alits klilised hendid el fa fr Compos alicyclique he ... more details
For machine tool coolant cutting fluid orphan date May 2010 Unreferenced stub auto yes date December 2009 Cutting compound consists of an abrasive suspended in a paste. Like most abrasives, it comes in various grit size grit sizes dependent upon how much matter is to be removed. It is used on automotive paintwork to cut through abrade oxidise d paint or to polishing polish out scratches in the paintwork. The oxidised paint is duller than fresh paint and the cutting compound is used to expose this fresher surface. Modern automotive painting often includes a thin, transparent protective coating on which cutting compound should not be used. Cutting is not something that should necessarily be done often as it will eventually strip all the paint from the surface, which both is less appealing and offers less chemical resistance. Wax ing to protect the newly exposed surface is an important part of maintenance. DEFAULTSORT Cutting Compound Category Automobile maintenance Automotive stub ... more details
Orphan date September 2008 The Compound shutter is a mechanical leaf shutter for photographic camera s introduced in the late 19th century, usually used between lens components. A typical Compound shutter may have settings for T Time , B Bulb , and times from 1 second down to 1 100th or less. Unlike later mechanical shutters such as the Compur which use a clockwork mechanism, shutter timing is achieved by releasing air from a small cylinder typically mounted horizontally at the top of the shutter through a small aperture. A cam turned by the shutter speed dial positions a piston in the cylinder to provide the correct exposure. When the shutter release is pressed the shutter opens and air in the cylinder is gradually released, letting the piston move it closes the shutter when it reaches the end of its travel. The piston travels for a very short distance at the higher speeds, making their accuracy very sensitive to the precise manufacturing of the cam lower speeds are more reliably accurate. http www.skgrimes.com compound index.htm Compound Shutters for Large Format Photographers photography stub Category Photographic shutters ... more details