![Carbon Paper Disc](http://www.skyline2002.com/cdn/shop/products/P-061-CarbonPaperDisc_SetOf10_{width}x.jpg?v=1605428754)
- Carbon discs for rod mounted spark timer.
- A spark timer produces a physical record of a motion by making a mark on tape at set intervals.
- Students measure the distance between the marks and graph the motion.
- These carbon discs are an ideal supply for use in any science curriculum or laboratory setting