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Grade Range:
K-12
Resource Type(s):
Artifacts
Date Posted:
9/17/2015
Alfred Vail made this key, believed to be from the first Baltimore-Washington telegraph line, as an improvement on Samuel Morse's original transmitter. Vail helped Morse develop a practical system for sending and receiving coded electrical signals over a wire, which was successfully demonstrated
Grade Range:
6-8
Resource Type(s):
Interactives & Media
Duration:
13 minutes
Date Posted:
7/25/2012
Learn about the history of predicting weather in the United States from actor Dwayne Starlin playing Joseph Henry, first secretary of the Smithsonian.  Henry played a crucial role in creating a weather prediction service in the United States that became the National Weather Service.  Th
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