In the field of control theory, for example, it aided in the further development of servomechanism design and control, a crucial component of modern robotics.
With the electronics revolution, single-signal channel circuit design became redundant and instead, radios provided coded signal streams which a servomechanism could interpret.
For example, an automotive power window control is not a servomechanism, as there is no automatic feedback that controls positionthe operator does this by observation.
Dynamic response characteristics such as winding inductance and rotor inertia are also important; these factors limit the overall performance of the servomechanism loop.
The windmill fantail is an earlier example of automatic control, but since it does not have an amplifier or gain, it is not usually considered a servomechanism.
In a potentiometric type of recorder, the direct drive of the marking pen is replaced with a servomechanism where energy to move the pen is supplied by an amplifier.
The plate's position can also be moved a small distance using a small manifold vacuum-operated servomechanism, providing advanced timing when the engine is required to speed up on demand.