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Tom prepared
to show off his latest creation for his local science fair. His
robot was intelligent, but not mobile. Sammy his robot, could
not walk up steps or move is arms up and down.
Tom used a
series of pulleys to help Sammy's arms move. When a single pulley
was pulled by Tom, Sammy's arms would be raised. Tom found this
to be difficult to use. Tom added weights to the opposite end
of the pulleys. When Tom pushed a switch, Sammy would raise his
arms. The only problem with this was that his arms would stay
up after the switch was pushed.
Tom built
Sammy what he called "Power Shoes." When Sammy had his
Power Shoes on, a lever would continuously rotate and allow him
to climb over surfaces up to one foot in height.
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