Cover Image: August 2001 Scientific American Magazine See Inside

Turning the Crank [Preview]















Share on Tumblr


Subscribe     Buy This Issue

Already a Digital subscriber? Sign-in Now
If your institution has site license access, enter here.

Comments

Add Comment
Leave this field empty

Add a Comment

You must sign in or register as a ScientificAmerican.com member to submit a comment.
Click one of the buttons below to register using an existing Social Account.

More from Scientific American

Turning the crank on Freeplay's Bravo AM/FM radio spins gears in a tiny transmission that drives an alternator.
Turning the crank on Freeplay's Bravo AM/FM radio spins gears in a tiny transmission that drives an alternator. It sends current to a 3.6-volt nickel--metal hydride rechargeable battery. A 30-second wind of sufficient torque will provide 45 minutes of low-volume play or 25 minutes of boom-box sound. Further cranking will extend play. An amorphous thin-film solar cell can provide added current for lazy listeners.
Latest News Most Read
See what we're tweeting about

Scientific American Editors

More »

Free Newsletters


Get the best from Scientific American in your inbox

Solve Innovation Challenges

Powered By: Innocentive

  SA Digital

Latest from SA Blog Network

  SA Digital

News From Our Partners

Science Jobs of the Week

Email this Article

Turning the Crank: Scientific American Magazine

X
Scientific American Magazine

Subscribe Today

Save 66% off the cover price and get a free gift!

Learn More >>

X

Please Log In

Forgot: Password

X

Account Linking

Welcome, . Do you have an existing ScientificAmerican.com account?

Yes, please link my existing account with for quick, secure access.



Forgot Password?

No, I would like to create a new account with my profile information.

Create Account
X

Report Abuse

Are you sure?

X

Institutional Access

It has been identified that the institution you are trying to access this article from has institutional site license access to Scientific American on nature.com. To access this article in its entirety through site license access, click below.

Site license access
X

Error

X

Share this Article

X