The principle by Charles Fey and the Liberty Bell
The first slot machine was invented by Charles Fey in San Francisco California U.S. in 1887.
Many, however, believe that Charles Fey completed the first slot machine in 1895. The original machine was of course much simpler mechanism. It consisted of three spinning reels containing a total of five symbols, Horseshoes, diamonds, spades, hearts and a bell (Liberty Bell), from which this machine took its name. By replacing ten cards with five symbols with three reels instead of five drums, the complexity of reading a winning result was significantly reduced, allowing Fey to develop an effective mechanism of automatic payment. Three bells in a row produced the biggest payment. Liberty Bell was a huge success and has created a thriving industry of mass production of gaming machines. Even when the use of these gambling devices, banned in his home country after a few years, Fey still could not meet demand for the game elsewhere. The Liberty Bell was so popular that it was copied by many slot machine manufacturers. Thus in 1907, manufacturer Mills from Chicago produced a slot machine the Operator Bell. By 1908 many “Bell” machines were installed in most cigar stores, saloon, bowling, brothels and barber shops. The original Liberty Bell machine can still be seen at the Liberty Belle Saloon & Restaurant in Nevada.
Follow by Sitman and Pitt
The Sitman and Pitt of Brooklyn, New York , U.S. developed a gambling machine in 1891 which was a precursor to the modern slot machine. It contained five drums holding a total of 50 card faces and was based on poker. This machine proved extremely popular and soon many bars in the city had one or more of the machines. They inserted the currency and pulled the lever which turned the drums and the cards they held, while the player hoped a good poker hand . There was no direct payment mechanism, so a pair of kings might get the player a free beer, whereas a Royal Flush cigars or drinks. The awards were entirely depended on the offers in each local installation.
Other early machines
One-armed bandits at Wookey Hole Caves
Other early machines, such as trade stimulator, were distributing profits in the form of chewing gum with fruit flavors, depending on the tastes which appear on the cards of the game. The popular cherry and melon symbols derive from this machine. The symbol BAR, most common and widespread on slots came from the company logo Bell-Gum Fruit. The payment of food prizes was a commonly used technique to avoid laws against gambling in the States. The great success of the slot based on the desire of the player to gain a lot by betting very little.
The electromechanical slot machine
In 1963, Bally developed the first fully electromechanical slot machine called money honey. Though earlier the High Hand a poker machine by Bally had exhibited the basics of electromechanical construction only in 1940. The electromechanical approach of the 1960s allowed the money honey to be the first slot machine with a bottomless hopper and automatic payment combinations, up to 500 coins, without the help of an attendant.
The popularity of this machine led to the increasing prevalence of new electronic format and the side lever soon became vestigial.
The Video Slots
The first true electronic slot (video slot) was developed in 1976 by N. Cerracchio, R. Greene, W. Beckman, J. Reukes, and L. Black in the company Fortune Coin Co., Las Vegas, NV. This slot machine used a modified 19-inch color screen of the Sony boards and software for all machine functions. The original machine was incorporated in a cabin - slot. The first video slot machine was placed at the Hilton Hotel in Las Vegas and after some security modifications against cheating of the machine; it got approval from the state of Nevada.
The first electronic slot machine with two screens created in 1994 in Australia followed by America in 1996. In this type of machine, the display on the screen was changing, giving the player a different environment, in which he could claim a bonus.