You are here:
About.com

FREE Newsletter

 
Inventors Altimeter
The altimeter is an instrument which measures vertical distance with respect to a reference level. The altimeter is an instrument that measures the altitude of the land surface or any object such as an airplane. Louis Paul Cailletet was the French physicist who invented the altimeter and the high-pressure manometer.

Louis Paul Cailletet (1832-1913)
French physicist and inventor who in 1877-78 was the first to liquefy oxygen, hydrogen, nitrogen, and air.

Barometric Altimeter
In 1928, German inventor Paul Kollsman changed the world of aviation with the invention of the world's first accurate Barometric Altimeter also called the “Kollsman Window”.

Radio Altimeter
Lloyd Espenschied invented the first radio altimeter in 1924. In 1938, the fm radio altimeter was first demonstrated in New York by Bell Labs. In the first public display of the device, radio signals were bounced off the ground, showing pilots the altitude of an aircraft.

Return History of Measurement

©Mary Bellis

Subscribe to the Newsletter
Name
Email

From Mary Bellis,
Your Guide to Inventors.
FREE Newsletter. Sign Up Now!

Important disclaimer information about this About site.


Newsletters & RSSEmail to a friendAdd to del.icio.us
 
All Topics | Email Article | |
Our Story | Be a Guide | Advertising Info | News & Events | Work at About | Site Map | Reprints | Help
User Agreement | Ethics Policy | Patent Info. | Privacy Policy | Kids' Privacy Policy

©2006 About, Inc., A part of The New York Times Company. All rights reserved.
Mental Health

Depression Self-Test Vitamins for Depression? Bipolar Red Flags Coping With Disasters Celebrities With Bipolar

What's Hot

Gyroscopes - Elmer Sperry and Charles Stark Draper Gyroscope...Angel AlcalaThe History of the BikiniRusi Taleyarkhan Jack Johnson