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Harold DeForest Arnold
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Introduction References & Edit History Quick Facts & Related Topics
Quizzes
Michael Faraday (L) English physicist and chemist (electromagnetism) and John Frederic Daniell (R) British chemist and meteorologist who invented the Daniell cell.
Faces of Science
Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Physics and Natural Law
Related Questions
Read Next
Highway Night Traffic Portland, drive, driving, car, automobile.
What's the Difference Between Speed and Velocity?
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64
Gravity: From Apples to the Universe
Discover
World Data Locator Map: Australia
Is Australia an Island?
Martin Luther King, Jr.
Why We Celebrate MLK Day
Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.
5 Remarkably Close U.S. Presidential Elections
Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)
6 Cultures That Recognize More than Two Genders
Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.
12 Greek Gods and Goddesses
United States Presidential Election of 2012. Mitt Romney. Official portrait of President Barack Obama in the Oval Office, Dec. 6, 2012 after his reelection Nov. 6, 2012. Official portrait Obama
10 Democrats Who Made History
jeans, denim, pants, clothing
Why Do We Say “A Pair of Pants”?

Harold DeForest Arnold: References & Edit History

Article Contributors

Primary Contributors

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
First paragraph modernization. Feb 13, 2024
Anniversary information added. Aug 30, 2023
Anniversary information added. Jul 06, 2023
Add new Web site: Audio Engineering Society - Sound Recording Research at Bell Labs. Jun 12, 2016
Article revised. Aug 14, 2003
Article added to new online database. Jul 20, 1998
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