Spare large roll of white paper used on Air Tracks for spark recording. 20mm wide x180m long. For use with IEC Spark Generator 240V AC (LB0118-001).

This white paper is wider than the 'Recording Timer' paper and it lies over the spark paper. As a spark is shot through both papers to earth, a black dot is erupted to the underside of this white paper, thus forming a set of black dots that relate to velocity.