Discussion
Arrange these gyro technologies in the historical order in which they entered service:
1. Air-driven spinning mass gyros
2. Electrically driven spinning mass gyros
3. Ring laser gyros
4. Fibre optic gyros
Select the correct sequence.
Answer: B
The progression runs from a rotor driven by a vacuum pump to one driven electrically, then to optical devices with no moving parts at all. Each step removed a class of failure and drift that the previous one could not eliminate.
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