I.S. 289 G.E.A.R.S.
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The I.S. 289 Invention: Hammer in a Nail! “Rube Goldberg” knocks down a funnel (1), tipping a lever (2) which pulls on a string (3) to remove a square of cardboard from the ramp. The cardboard square was holding back marbles, which are now free to move down the ramp (4). The marbles hit a piece of radiator pipe (5), which falls into a bucket (6). The bucket is attached to a pulley system, which lifts a crate (7). The crate was holding back two wind-up cars, which now roll down a ramp (8) and hit a book. The books fall like dominoes (9) and knock over a cluster of radiator pipes and party favors tied together (10). The pipes and party favors are attached to a pulley system, which lifts the back of the hammer (11). This hammers the nail (12).