Innovation in navigation: What did Elmer A. Sperry invent that revolutionized marine and aviation guidance? Identify the specific gyroscopic device. Choose the correct option.

Difficulty: Easy

Gyrocompass (marine gyroscopic compass)
Ballpoint pen
Barometer
Steam turbine

Correct Answer: Gyrocompass (marine gyroscopic compass)

Explanation:

Given data

The prompt asks for Sperry's notable invention in guidance/navigation.

Concept / Approach
Elmer A. Sperry pioneered gyroscopic technologies including the gyrocompass and gyrostabilizers, crucial for ships and aircraft.

Why others are incorrect
Ballpoint pens, barometers, and steam turbines were invented by different innovators.

Final Answer
Gyrocompass (marine gyroscopic compass).

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