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A diving watch, also commonly referred to as a diver's or dive watch, is a watch designed for underwater diving that features, as a minimum, a water resistance greater than , the equivalent of . The typical diver's watch will have a water resistance of around , though modern technology allows the creation of diving watches that can go much deeper. A true contemporary diver's watch is in accordance with the ISO 6425 standard, which defines test standards and features for watches suitable for diving with underwater breathing apparatus in depths of or more. Watches conforming to ISO 6425 are marked with the word DIVER'S to distinguish ISO 6425 conformant diving watches from watches that might not be suitable for actual scuba diving. ==History== The history of efforts to use watches underwater and to make watches that are water resistant, or waterproof and to make dive watches goes back to perhaps the 17th century. In the 19th century water and dust resistant watches were usually one-off pieces custom made for a particular customer and described as "Explorer's Watches". Hard hat divers of that period sometimes placed common pocketwatches on the inside of their helmets in order to know the time spent under water. 〔(What Did Divers Use Before Dive Watches? By Roger Ruegger, WatchTime.com, May 2014 )〕 Early in the 20th century such watches were industrially produced for military and commercial distribution. Like their predecessors early 20th century dive watches were developed in response to meet the needs of several different but related groups: explorers, navies, and professional divers. In 1926, Rolex created the new “Oyster” watch, featuring a hermetically sealed case. On 7 October 1927 an English swimmer, Mercedes Gleitze attempted to cross the English Channel with a new Rolex Oyster hanging round her neck by a ribbon on this swim. After more than 10 hours in the chilly water the watch remained sealed and kept good time throughout.〔http://www.qualitytyme.net/pages/rolex_articles/m_gleitze.html The Vindication Swim: Mercedes Gleitze and Rolex take the plunge and become world-renowned... By John E. Brozek International Wristwatch Magazine, 24 September 2015〕 Omega SA is credited as the creator of the world's first industrially produced diving watch intended for commercial distribution, the rectangular Omega "Marine" with a patented double sliding and removable case, introduced in 1932. After a series of trials undertaken by the Swiss Laboratory for Horology in Neuchâtel in May 1937, the watch was certified as being able to withstand a pressure of , equivalent to a depth of , without any water intake whatsoever.〔(Omega Marine 1932 Museum Collection Limited Series )〕 By today's standards, the Omega Marine was no more a divers watch than the Rolex Oyster which preceded it. Indeed, the Rolex Oyster had more in common with a modern divers watch than the Omega, since it had a metal bracelet instead of the leather band of the Omega. Following a request made by the Royal Italian Navy, in September 1935, for a luminous underwater watch for divers, Panerai offered "Radiomir" underwater timepieces in 1936. These watches were made by Rolex for Panerai. 〔(Radiomir 1936 - 47mm )〕 In addition, a large number of "canteen" style dive watches by Hamilton, Elgin or Waltham were made to military specification during and after World War II. However, these watches were made in small numbers, and were not intended for large-scale commercial distribution. Today, interest in these watches is limited to collectors.〔(【引用サイトリンク】publisher=Rolex )〕 In 1953, Lip-Blancpain's ''Fifty Fathoms'' waterproof watch came on the market in France. Various models were issued by Blancpain in small quantities to the military in several countries, including US and French Navy combat diver teams. The Fifty Fathoms was worn by Jacques Cousteau and his divers during the underwater film "Le monde du silence", which won the Palme d'or at the Cannes film festival in 1956, and in the US when TV star Lloyd Bridges wore a Blancpain Fifty Fathoms dive watch in a photo that appeared on the cover of the February 1962 edition of ''Skin Diver Magazine''.〔 〕 The Rolex Submariner was introduced at the Basel Watch Fair in 1954 which coincided with the development of self-contained underwater breathing apparatus, known as scuba. In 1959, the United States Navy Experimental Diving Unit evaluated five diving watches that included the Bulova US Navy Submersible Wrist Watch, Enicar Sherpa Diver 600, Enicar Seapearl 600, Blancpain Fifty Fathoms, and the Rolex Oyster Perpetual. In 1961, Edox launched the ''Delfin'' line of watches, with industry-first double case backs for water resistance to 200 meters. They later released the ''Hydrosub'' line in 1963 featuring the first crown system with tension ring allowing depths of 500 meters. In 1961, Rolex began to include a skindiver handbook with the Submariner, then available in two models, one water resistant to , the other, less expensive version, to . It was the choice of watch for the character of 007 in the first ten James Bond films, causing the "Sub" to achieve an iconic status. During the 1960s, commercial work in the oceans and seas created professional diving organisations that needed more robust watches designed for diving operations at greater depths. This led to the development of the first 'ultra water resistant' watches like the Rolex Sea-Dweller 2000 (2000 ft = 610 m), that became available in 1967, and was produced in several variations, and the Omega Seamaster Professional 600m/2000 ft, also known as the "(Omega PloProf )" (Plongeur Professionnel), that became available in 1970, and was produced in several variations.〔(【引用サイトリンク】url=http://www.londonwatchcompany.com/watches/Rolex-sea-dweller2.htm )〕〔(【引用サイトリンク】url=http://www.deskdivers.com/Site/PloProf.html )〕〔(Omega PloProf Book )〕〔(Ploprof 600m and 1200m anyone ? part 1 )〕〔(Part II: Omega Ploprof 600 m and 1200 m comparison )〕 In 1983, the US Navy Experimental Diving Unit evaluated several digital watches for use by US Navy divers. In 1996, the International Organization for Standardization (ISO) introduced the standards and features for diving watches regulated by the ''ISO 6425 - Divers' watches'' international standard. Many contemporary sports watches owe their design to diving watches. The vast majority of divers now use electronic, wrist-worn dive computers.〔 A dive computer or decompression meter is a device used by a scuba diver to measure the time and depth of a dive so that a safe ascent profile can be calculated and displayed so that the diver can avoid decompression sickness. Diving watches and depth gauges are however still commonly used by divers as backup instruments for overcoming dive computer malfunctions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diving watch」の詳細全文を読む スポンサード リンク
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