(I have to confess that I am not certain the spelling is correct!) Scaffolding on wheels for moving around the stage to rig and focus lanterns.

A retractable alloy vertical ladder on an adjustable wheeled base. The platform at the top is just large enough to hold one person. Used for rigging lanterns, focusing etc. Collapsible enough to fit through a standard doorway. Outriggers are used to stabilise the tower from falling sideways. Two people are used to move and steady the tallescope. Sometimes known as a "TALLEY".