in 1882 in Frankfurt during a patent exhibition. It covered and operated for two months; the refrigeration system was designed by Jahre Linde, and was probably the first skating rink where ammonia was used as a refrigerant. Ten years later, a larger rink was permanently installed on the same site. United States Early indoor ice rinks Ice skating quickly became a favorite pastime and craze in several American cities around the mid 1800s spawning a construction period of several ice rinks. Two early indoor ice rinks made of mechanically frozen ice in the United States opened in 1894, the North Avenue Ice Palace in Baltimore, Maryland, and the Ice Palace in New York. The St. Nicholas Rink, ( "St. Nicholas Arena"), was an indoor ice rink in New York City which existed from 1896 until its demolition in the 1980s. It was one of the earliest American indoor ice rinks made of mechanically frozen ice in North America and gave ice skaters the opportunity to enjoy an extended skating season. The rink was used for pleasure skating, ice hockey, and ice skating, and was an important rink involved in the development of the sports of ice hockey and boxing in the United States. Oldest indoor artificial ice rink in use The oldest indoor artificial ice rink still in use in the United States is Boston, Massachusetts's, Matthews Arena (formerly Boston Arena) which was built between 1909 and 1910. The rink is located on the campus of Northeastern University. This American rink is the original home of the National Hockey League (NHL) Boston Bruins. The Bruins are the only remaining NHL team who are members of the NHL's Original Six with their original home arena still in existence. Contemporary The Guidant John Rose Minnesota Oval, (formerly the John Rose Minnesota Oval), is an outdoor ice rink in Roseville, Minnesota that is large enough to allow ice skaters to play the sport of bandy. The facility was constructed from between June and December in 1993. It is the only regulation sized bandy field in North America and serves as the home of USA Bandy and its national bandy teams. The rink has been claimed to be the largest artificial outdoor ice skating surface in modern North America. Canada The first building in Canada to be electrified was the Victoria Skating Rink which opened in 1862 in Montreal, Quebec, Canada. The rink was