The only US nickels that contained any silver were made from late 1942 through 1945. The silver-alloy coins have a large mint mark above Monticello's dome instead of a small mark to the side. The letter P was used for Philadelphia issues for the first time on any coin.
Dimensions. A curling rink should be 150 feet long and have a maximum width of 16 feet, 5 inches. If a facility is too small to hold rink(s) with these dimensions, a rink can be a minimum of 146 feet long and 14 feet, 6 inches wide. The perimeter of the rink can be marked by raised barriers or by lines drawn on the ice.f a facility is too small to hold rink(s) with these dimensions, a rink can be a minimum of 146 feet long and 14 feet, 6 inches wide.
Playing surface. The curling sheet is an area of ice 146 feet (45.5 m) in length by 14 feet 2 inches (4.318 m) to 16 feet 5 inches (5.0038 m) in width, carefully prepared to be as close to level as possible. A key part of the preparation is the spraying of water droplets onto the level ice.