Portable mechanical random number generator - comprises case attached to e.g. key ring and containing numbered balls of contrasting colours which enter parallel compartments

摘要

The device has a case formed from a base plate containing a hollow area comprising a mixing chamber has a transparent cover fixed over the hollow area. Balls are free to move and mix in the chamber when it is inclined from the horizontal. Several compartments provide locations where the balls are imobilised and which are in the same plane as the mixing chamber. These compartments consist of parallel passages separated by walls and communicating separately with the mixing chamber through an opening. This opening allows only one hall at a time to Pass. This ensures that the balls are stacked in each compartment Each ball carries a different figure or sign and a number have a contrasting colour to the rest to facilitate reading of the particular numbers to form a combination.