Linear transducer arrangement

An arrangement for generating control signals for use by a conventional control system of a machine in controlling movement of individual hydraulically moveable ends of a tool carried by the machine so as to maintain a selected elevational position between each end of the tool and a reference when reception of one of the elevation receivers of the reference is interrupted, comprising:

• a pair of elevation receivers mounted for movement with opposite ends of said tool carried by said machine to provide signals to the control system indicating the elevational position between each end of said tool and said reference,
• a first linear transducer mounted on a first end of the tool;
• and
• a second linear transducer mounted on a second end of the tool, the first and second linear transducers providing electrical outputs indicating the extension of elevation cylinders of the hydraulically moveable ends of the tool, thus providing to the control system the relative height of the interrupted elevation receiver to the uninterrupted elevation receiver until the disruption clears.