The bomb that is placed in Grantham's car uses a mercury switch. This is made of a glass ampule that contains a pair of metal contacts and an amount of mercury. It is designed so that when moved in such a way that the mercury touches both of the leads, this completes the circuit and detonates the bomb.
The Pelican Brief
Two Supreme Court Justices have been assassinated. One lone law student has stumbled upon the truth. An investigative journalist wants her story. Everybody else wants her dead.
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