Elevator safety pioneer: What did Elisha Otis invent that made passenger elevators practical? Context: Mid-19th-century safety demonstration preventing car fall if the hoisting rope failed. Choose the correct invention.

Difficulty: Easy

The elevator safety brake (safety elevator)
The electric traction motor
The hydraulic piston elevator
The escalator

Correct Answer: The elevator safety brake (safety elevator)

Explanation:

Concept / Approach
Elisha Otis invented a safety brake that prevents an elevator car from falling if its hoisting rope breaks, demonstrated famously in 1854. This made passenger elevators acceptable and safe.

Final Answer
The elevator safety brake (safety elevator).

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