(57) An analogue display has a circle (71) of electrically- energisable elements (70)that
are selectively energised such as to represent time. A rotatable setting wheel (10)
has a knurled edge (26) that projects from the display casing (1). A leaf spring (28)
engages the knurled edge, the spring having a piezo-electric element (29) on its surface
which produces pulses dependent on rotation and direction of rotation of the wheel.
Different elements (70) are energised around the circle, as the wheel is rotated,
accordito the speed and direction of rotation. A second value, such as temperature,
can be represented if each element (570) extends radially and is divided into separate
sub elements (580). By energising different numbers of the sub elements (580) the
apparent radial length of the element can be varied to represent the second value.
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