valve

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Types of valves. globe, butterfly, poppet, and spool

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Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)

The Seven Sacraments of the Roman Catholic church

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.

Will Light-Speed Space Travel Ever Be Possible?

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

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Types of valves. globe, butterfly, poppet, and spool

gasoline engine lubrication system

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poppet valve safety valve plug valve spool valve intake valve exhaust valve butterfly valve expansion valve globe valve machine particle accelerator clock robot lubrication simple machine balance sundial drilling machinery optical interferometer oscilloscope

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