A pantograph is a commonly used overhead suspension system for lamps and audio and video monitors in television studios. It is also used on a smaller scale in many photography studios. Using either motor driven cables or a spring system, the pantograph can be balanced so that a light touch can readjust the height of the load (usually a lamp). The system usually works through a series of connected diagonals that can be compressed or extended to adjust the height of the rig.
External links Doughty Pantographs IFF manual pole operated pantograph IFF manual operated friction pantographs IFF motorized pantograph Bowens Website Goto to "Accessories", then "Overhead/Pantograph" section (website doesn't allow direct links)