PA 0117-001

AIR TRACK,SPARK PAPER ROLL,BLACK,10mx20mm WIDE.

 

Unit: EACH

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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.