variometer

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Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles

Why Is Pluto No Longer a Planet?

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

Attack on Pearl Harbor. December 7, 1941. Pearl Harbor infographic. World War II. Hawaii. United States. Japan. SPOTLIGHT VERSION

Attack on Pearl Harbor Timeline

Vietnam War. U.S. President Lyndon B. Johnson awards the Distinguished Service Cross to First Lieutenant Marty A. Hammer, during a visit to military personnel, Cam Ranh Bay, South Vietnam, October 26, 1966. President Johnson

Vietnam War Timeline

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Sailboat against a beautiful landscape

Which Waters Do You Pass Through When You “Sail the Seven Seas”?

Horses. Equus caballus. Horse stable. A brown horse looks out from his stall through the window.

Horsing Around: 7 of the Weirdest Racehorse Names in History

variometer

instrument

Learn about this topic in these articles:

use on gliders

In gliding
…most important instrument is the variometer, which shows when the glider is moving up or down even when that movement is too minute to be noticed by the pilot.
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