The flat spring present in Asteroid barometer

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Depress the rod

Elevate the rod

Protects diaphragm from collapsing

Decreases atmospheric pressure

answer is C.

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Detailed Solution

Concept: The pressure of the atmosphere is also measured with asteroid barometers. However, unlike other barometers, it does not contain any fluids. For accurate readings, elaborate mechanical systems are required. They were satisfactory gadgets due to their compact design, stability, and ease of transport.
A flat spring and a couple of hair springs can be found in this gadget. The flat spring prevents the diaphragm from collapsing when it comes into contact with other mechanical systems. Because the diaphragm expands and contracts in response to air pressure.
Hence, the correct option is 3.

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