Arfa Daily wrote:

The blower and ball system is a lot more random than the current computer
system, which generates very definite patterns, no matter what the bingo
clubs would have you believe to the contrary.

Actually Arfa, it`s very easy for an experienced bingo caller to
manipulate games using the old blower machine. He can make games last
longer in slack periods or get them over quick when it`s busy, and in
bingo halls or stalls with fixed cards, a good operator can direct the
wins to various areas of the house - possibly even to individual
players. It was even easier to manipulate a game in the earlier days of
the game, where wooden balls were rolled down a chute directed by the
stallholder.

Ron(UK)