0
Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
0
Rough Science
Explore the Challenges
Solve the Web Challenge
Meet the Rough Scientists
About the TV Series
Discover More
Feedback
Site Map
Explore the Challenges

The Challenge: Record a Sound or Voice



How was a recording made?

To make a recording, or rather an attempt at a recording, the cylinder needed to be turned. The drawing pin stylus was placed onto the wax so that it pushed in about 0.5 to 1 mm (0.02 - 0.04 in.). The handle was turned at an even rate and we shouted into the horn.

Then we re-adjusted the drawing pin in the wax and used the last half to have a go at recording under slightly different conditions, hoping that one of these two recordings would have worked.

Diagram of stylus pushed into the groove

Stylus pushed into the groove