When was the first smoke alarm invented?

The first smoke alarm was indeed invented in the 1930s. This time period marked a significant advancement in fire safety technology as the dangers of smoke inhalation and fire became better understood. Early smoke alarms were often manual devices that required human intervention, but they laid the groundwork for the sophisticated smoke detectors we have today.

Option A refers to the 1940s, a time when smoke detectors began gaining popularity but were not yet widely used or developed. Option B points to the late 1800s, which predates significant advancements in fire detection technology. Meanwhile, option D suggests the 1960s, a period when modern electric smoke detectors were introduced, but this came after the initial invention in the 1930s. Understanding the timeline of smoke alarm development is crucial for appreciating the evolution of fire safety measures.