CHAPTER 7Laser-Grid Intruder Alarm
LASER BEAMS LINE THE ENTRYWAY to the Evil Genius’ Lair (Figure 7-1), forcing the secret agent to bend and arch through the beams in a series of agile moves. With skills honed by years of Twister and limbo dancing, the agent navigates his way through the beams. Suddenly an alarm sounds and vertical doors slam to the ground, trapping the agent. The Evil Genius triumphs again.
This is a working alarm. It uses a laser beam that bounces between mirrors attached to two walls that face each other. For instance, the entrance to the Evil Genius’ Lair. When the beam is broken, a buzzer sounds.
Note that the more ingenious ...
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