These were the âBlue Bladeâ type that had a blue oxide finish, and that finish, in contact with an ordinary pencil âleadâ, made a point-contact rectifier. This served the purpose of the âcrystalâ and âcats whiskerâ of early crystal radios; it permitted current coming in from the antenna to flow in only one direction.
Age restrictions: To participate in the state lottery or horse track betting you must be 18 years old. To gamble in a casino or on a video poker machine, you must be 21. Casinos and Racetracks: Riverboat casinos are legal in Louisiana.
You have to be 21 years old to gamble or be in the gambiling area of a casino in the state of Nevada, as per Nevada Gaming Commission. Someone under the age of 21 can walk through a casino in order to get to a restaurant, guest rooms, restrooms, or kid's arcade, but they can not linger in the gaming area. There are some hefty fines, up to $10,000, if a minor gets caught gambling.