What mechanisms inside an aneroid barometer make the needle move to the correct marking?

Question

I know that the air pressure affects the aneroid capsule by making it expand and contract slightly, but how do the mechanisms inside display it on the face of the instrument?

In: Engineering

Answer 1

levers magnify the motion of the capsule, the linear movement of the last lever is attached to a tiny chain that is wrapped around the shaft of the pointer.