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