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.
The Ice Sheet. Each curling sheet is a patch of ice, 44.5 metres (146 ft) by 4.3 to 4.75 metres (14 ft 2 in to 15 ft 7 in), with identical sets of circles near each end. At the centre of the target, which is called the  house , is a  tee line  and small circle called the  button .Around the button are circles of diameters of 1.22 m (4 ft), 2.44 m (8 ft), and 3.66 m (12 ft).he curling Sheet. Each curling sheet is a patch of ice, 44.5 metres (146 ft) by 4.3 to 4.75 metres (14 ft 2 in to 15 ft 7 in), with identical sets of circles near each end.