Telescopic arrangement

A telescopic arrangement having a hollow cylinder and a part which is telescopically engaged with the cylinder, in which the arrangement is provided with at least one coil constituting a first form of pulse-induction device, and at least one target constituting a second form of pulse-induction device, to monitor the position of the said part relative to the cylinder, wherein a plurality of devices each of one of the first and second forms of device are positioned on the outside of the cylinder, at different respective positions therealong, and at least one of the other of the said first and second forms of device is fixed relative to the said part of the arrangement in a position such that it is moved over the said plurality of devices in succession as the said part is telescopically moved relative to the cylinder of the arrangement;

• wherein the telescopic arrangement is provided with a sleeve that is fixed relative to and surrounds the said part of the arrangement and within which extends the cylinder, or at least a portion of the cylinder, depending upon the position of the said part relative to the cylinder, the said at least one of the said other form of device being attached to the interior of the sleeve at the end thereof from which extends a portion of the cylinder.