A small amount of mercury
in a closed tube with 2 metal contacts in one end. The switch is attached to the
truck lid. When the lid is closed, the mercury is at the opposite end of the
tube, not making contact with the electrical contacts. When the lid is opened,
the mercury slides to the other end, connecting the 2 contacts (It is
conductive) closing the circuit and turning the light on.
"Other than that, Mrs. Lincoln, how was the play?" Dave <(^¿^)>
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