Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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As Clark and Carol's affair progresses, DTF St. Louis begins to lionize Floyd, highlighting his kindheartedness and his understanding relationship with his stepson Richard (Arlan Ruf). It's as if the show forgets that he, too, is actively trying to cheat, reducing him instead to a virtuous teddy bear in death. Clark and Carol risk being flattened as well, turned into nothing more than streaks of blithe idiocy and cold manipulation.
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