(57) A rolling mill has a transducer for measuring the separation of a movable part of
the mill from the fixed part of the mill. The transducer comprises a magnetostrictive
element secured to one end of the parts, a transmitter for transmitting magnetostrictive
signals into the element, a receiver for receiving signals reflected back along the
element and magnetic means secured to the other part which produces a magnetic field
which serves to reflect the signals along the element. Time measuring means measure
the time interval between transmitting the energy and receiving the echo and this
is representative of the distance between the two parts of the rolling mill.
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