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.
The legal age to gamble in California is 18 years or older. However, most Indian casinos serve alcohol and have set the minimum age to enter at 21 to comply with the minimum age of 21 required by their alcohol license. Some casinos allow people under 18 or 21 years old to enter unrestricted areas in their building, but you should check with the casino first before visiting. Other casinos enforce the 21 years limit throughout their facility.