Why might a Bourdon tube be manufactured in the shape of a helix?

The design of a Bourdon tube in the shape of a helix is primarily beneficial because it has enough power to move the pens of a recorder without the need for gears. This characteristic is crucial in applications where direct transmission of measurement to a recording device is needed.

By utilizing a helical shape, the tube can effectively convert pressure changes into a mechanical movement that is both precise and significant. This design allows for greater sensitivity; as pressure varies, the movement of the helix can generate a strong enough force to actuate the recording pen directly. This eliminates the complexity and potential inaccuracies that might arise from a more complicated gear mechanism.

Moreover, the helix shape can provide additional advantages in terms of space conservation, as it allows for a compact design. However, the most significant aspect is its ability to produce sufficient mechanical movement for recording purposes without external mechanical advantages, making the recording process simpler and more efficient.