PIRA 1C30.10 Measuring g: Freefall Timer

• Turn switchbox to the electromagnet position.
  
• Reset contact pad!!! - Which is a drop switch. -
  
• Reset and zero the timer.
  
• Position steel ball under the electromagnet at the top of the ring stand.
  
• Turn switchbox to clock position and the ball will drop.
• The above step also turned on the clock, which will then stop when the ball hits the contact pad of the stop switch.
• Demo Staff: This demo needs to be set up and tested on the day before it is needed.
  
• Also, adjust the power supply only to 12 V.
  

Picture shows demonstration used at the University of Texas at Austin.

Drawing below is from the University of Minnesota.