Timing the flight of the projectile in the classical ballistic pendulum experiment Available to Purchase

An apparatus has been designed and constructed to measure the time of flight of the projectile fired by the Blackwood pendulum apparatus. Microphones mounted on the pendulum base and on a metal target plate yield signals, which after amplification and shaping by custom designed circuitry, start and stop a commercial digital timer. The purpose, use, and design of these accessories are described.