🇬🇧 English instruction:
Spin the barrel.
Pluck one of the strings and observe it.
What do you notice when the barrel spins slower or quicker?
- Pluck a string. What can you see? What can you hear?
- What do you see when the barrel is spinning?
- What happens when the barrel is spinning slower?
- What’s the difference between the strings?
The strobe effect has many technical appliances. On good record players, the strobe effect is used to discern and adjust the rotation speed of the turntable. It is also used to discern the revolution rate of rotating machines or discover faults in rotating parts.