An example of a very simple mechanism that can be modeled by a state machine is a turnstile.

As the innocent customer discovers that the machine is broken, the con artist offers to swipe the rider through the turnstile on their own card in return for $ 2. 25 ( the same as the regular fare ).

The terminal could be a shared personal computer, a public kiosk, a ticket machine, a turnstile or an automated teller machine ( ATM ).

The user feeds the Carte orange ticket into a turnstile upon entering a metro station, and the machine, after reading the ticket, returns it to the user.

( The elevator has a dedicated turnstile ; however, an Addfare machine, which is used to add funds to an already-printed BART ticket, is only available inside the main station entrance.

These can be enforced by personnel such as a border guard, a doorman, a ticket checker, etc., or with a device such as a turnstile.

An access control point, which can be a door, turnstile, parking gate, elevator, or other physical barrier where granting access can be electronically controlled.

( In some presentations of natural deduction, the s and the turnstile are not written down explicitly ; instead a two-dimensional notation from which they can be inferred is used ).

Classically, the formulae on the left of the turnstile can be interpreted conjunctively while the formulae on the right can be considered as a disjunction.

If multiple people are riding together on the same MetroCard the first person can swipe the card through the necessary number of times and other riders can walk through the turnstile following them.

Thus a turnstile can be used in the case of paid access ( sometimes called a faregate when used for this purpose ), for example public transport as a ticket barrier or a pay toilet, or to restrict access to authorized people, for example in the lobby of an office building.

A disadvantage to this type is people can " jump the turnstile ".

In symbolic form weakening rules can be written as on the left of the turnstile, and on the right.

It has two staircases from each platform, a waiting area that can be used as a crossover, turnstile bank, token booth, and two street stairs going up to the southeast and southwest corners of 103rd Street and Lexington Avenue.

Examples are the turnstile, which one skates through to set spinning, injuring any who travel through it, the laser hurdle, which players must avoid at all costs, and the killball charger, which one skates through while carrying the rok to convert the rok into a killball, a high voltage electrocutor that can be thrown at others.

This sometimes results in a traveller being stuck in the station until they can attract the attention of a metro employee, or jump the turnstile.

When Akeem jumps the turnstile and " Van Wyck Boulevard " can be seen in the background above the toll booth.

The latter can be passed without paying when somebody else leaves, and by multiple persons if only one pays ( as opposed to a coin-operated turnstile ).

Inference rules may also be stated in this form: ( 1 ) some ( perhaps zero ) premises, ( 2 ) a turnstile symbol, which means " infers ", " proves " or " concludes ", ( 3 ) a conclusion.

One way to express this is that a comma to the left of the turnstile should be thought of as an " and ", and a comma to the right of the turnstile should be thought of as an ( inclusive ) " or ".

At first sight, this extension of the judgment form may appear to be a strange complication — it is not motivated by an obvious shortcoming of natural deduction, and it is initially confusing that the comma seems to mean entirely different things on the two sides of the turnstile.

Direct payment by coins at turnstile is also accepted but no change will be provided.

The user inserts a ticket or pass into the slot, from which a barcode is read ; if access is to be granted, a sensor determines the speed with which the user passes through, and sets the electric motor to turn the turnstile at the corresponding speed.

Here we are taking the RHS Σ to be a single proposition C ( which is the intuitionistic style of sequent ); but everything applies equally to the general case, since all the manipulations are taking place to the left of the turnstile symbol.

It was also the first arena to be built with luxury boxes and a computerized turnstile system.

The turnstile building on Neville Street is category 1 historic buildings and would be protected during any potential developments due to the sale.

:" I remember quite well my excitement on going through the turnstile to be let at large in a big, quiet, nice smelling place with a lot of pictures hanging on the walls and here and there students sitting on high stools copying at easels.

Depositing a coin or token in a slot on the turnstile unlocks the arms, allowing them to rotate by one-third of a complete turn, allowing a single customer to push through.

A 60 milliwatt transmitter fed a dipole antenna consisting of two fiberglass slot antennas in the body of the satellite operating on 108. 03 MHz, and four flexible whips forming a turnstile antenna were fed by a 10 milliwatt transmitter operating on 108. 00 MHz.

Ireland's Freeman's Journal reported that, The spectators were startled by a volley of shots fired from inside the turnstile entrances.

This scam is often run by a team of 2 or more people, with one person working the turnstile and the others acting as lookouts.

When the NYC subway still used tokens, token suckers would steal tokens by jamming turnstile coin slots, waiting for unsuspecting passengers to deposit tokens ( only to discover that the turnstile did not work ), then returning to suck out the token.

Conventional mathematical logic consists of tautological formulae, signalled by a prefixed turnstile.

Pedestrian toll is collected by an automatic turnstile when leaving Canada.

Outside of the large turnstile bank that provides access to and from the station, there is a token booth and passageway on each side separated from the waiting area by a steel fence.

The original Piggly Wiggly Store, Memphis, TennesseeAfter leaving Clarksville, Tennessee, on September 6, 1916, Saunders launched the self-service revolution in the USA by opening the first self-service Piggly Wiggly store, at 79 Jefferson Street in Memphis, Tennessee, with its characteristic turnstile at the entrance.

This building includes two large artworks: " Morning Glory " by Louis de Niverville, a surreal enamel mural sited on the ground level by the stairwell ; and " Barren Ground Caribou " by Joyce Wieland, a huge quilt featuring caribou in a tundra landscape, located near the unmanned turnstile entrance below.

Huge improvements happened to the ground during the 1927 / 28 season ; the galvanised iron boundary was replaced by a 10 ft wall having 20 turnstile houses and entrance and exit gates at a cost of £ 2, 520.

In 2006 another turnstile was donated, this time by Southend United and a new covered stand was built.

In 2007, the Dragons announced that they would not be playing home games at Kogarah for the 2008 season so that Stage 2 redevelopment of the ground could be completed with new roofed extension on the Southern side of the main grandstand increasing capacity by around 2000, and further upgrading to the hill area, including turnstile facilities and strengthening the retaining wall at the Southern Jubilee Avenue end.

State diagram for a turnstile

This usually embodies the relational ( as opposed to functional ) view of a rule of inference, where the turnstile stands for a deducibility relation holding between premises and conclusion.

A modern turnstile for Fairs, Attractions & Arenas.

The introduction of computerised ticketing, zonal public address systems and closed-circuit television for monitoring turnstile areas meant that Ibrox was at the forefront of stadium management.

The station house has a turnstile bank, token booth, and three street staircases to all four corners of Morrison and Westchester Avenues except for the northwest one.

By 1922 the Club had a membership of over 500, seating accommodation for 3, 500 and a turnstile at every entrance.

The fare control for the Flatbush Avenue-bound platform is normally unstaffed, containing one High Entry Exit Turnstile and one exit-only turnstile.

The full generalization rule allows for hypotheses to the left of the turnstile, but with restrictions.

In many cultures it is customary to tip the attendant, while other public toilets may charge a small fee for entrance, sometimes through use of a coin operated turnstile.

Guests with valid paid admission received a voucher at the main gate turnstile to exchange for the card of the day, each in a series featuring the landmark attraction of the year starting with 1955.

This category encompasses a wide variety of criminal activity including, but not limited to, tampering with ( or bypassing ) a utility meter so that the true level of consumption is understated ; leaving a hotel or restaurant or similar establishment without paying for the service ; and " turnstile jumping " or other methods of evading the payment of a fare or fee when using a public transit vehicle or entering a private facility normally requiring payment ( e. g., jumping over the fence at a fair or rock concert ).

It was composed of a two-element turnstile array for video and a single-element circular dipole for sound transmissions.

It was also notable for housing the oldest working football turnstile in the country, although this was only used on rare occasions.

With the ground closed, the old turnstile sold for £ 3, 050 at an auction staged at the ground on 17 June 2007, to a local Shrewsbury Town fan.

In Turkey pay toilets are common at bus stations and underground cities ( but not single-building shopping malls ), where a charge of between 50 kuruş and 1 lira is levied at a turnstile for entrance to the bathroom.

At the extreme north ( geographical east ) end of the station, a single staircase from each platform goes up to a single full height turnstile before a staircase goes up to either western corners of South Portland and Lafayette Avenues, the northwest one for the Queens-bound platform and the southwest one for the Church Avenue-bound platform.