Here's a short video featuring a nifty donation box installed at the Havant Arts and Heritage Centre.
A visitor/donor drops a coin into the machine and turns the hand crank. The coin is deposited into a small carriage mounted on a belt system. Turning the crank raises the coin to the top of the box where it is sent down a track. From there the coin falls into a waiting hand which, having caught the coin, tips over to drop the it into the next hand. It's a nice symbol of giving and how many small contributions can add up to something substantial.