AIR TRACK SPARK PAPER ROLL BLACK 10mx20mm WIDE

Spare roll of special black spark paper used on Air Tracks for spark recording.

It is placed under the white paper to leave a black dot on the underside of the white paper. As a spark passes 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.

Can be used for many runs before it becomes exhausted. 20mm wide x 10m long.

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Brand : IEC