Armature

The clay will be modelled on to a steel armature.  The armature is plotted from the maquette using the baseboard crosshairs and plumb lines and then welded onto a steel support known as a back-iron.  The back-iron takes most of the weight.  It is, of course, important that the armature runs through the middle of the final form.  Here is a sequence from back-iron to basic armature.