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- Q1544764 subject Q6646582.
- Q1544764 subject Q6937222.
- Q1544764 subject Q7115542.
- Q1544764 subject Q7773050.
- Q1544764 subject Q7865245.
- Q1544764 abstract "Greenleaf Whittier Pickard (February 14, 1877, Portland, Maine- January 8, 1956, Newton, Massachusetts) was a United States radio pioneer. Pickard was a researcher in the early days of wireless. He was responsible for the development of the crystal detector, (cat's whisker detector), a radio wave detector which was the central component in early radio receivers called crystal radios, which were the most widely used radio receivers until about 1920 and continued to be used until World War 2. He also experimented with antennas, radio wave propagation, and noise suppression.On August 30, 1906 he filed a patent for a silicon crystal detector, which was granted on November 20, 1906. Pickard's detector was revolutionary in that he found that a fine pointed wire known as a "cat's whisker," in delicate contact with a mineral produced the best semiconductor effect. On June 10, 1907, he filed a patent for a Magnetic Aerial (a loop aerial) which was granted on January 21, 1908. Pickard's loop antenna had directional properties that could be used to reduce interference to the intended wireless communications. Greenleaf Whittier Pickard was named after his great-uncle, the American Quaker John Greenleaf Whittier (1807-1892). Pickard was president of the Institute of Radio Engineers in 1913.".
- Q1544764 award Q678414.
- Q1544764 birthDate "1877-02-14".
- Q1544764 deathDate "1956-01-08".
- Q1544764 field Q43035.
- Q1544764 nationality Q30.
- Q1544764 residence Q30.
- Q1544764 thumbnail Greenleaf_Whittier_Pickard_in_his_Boston_laboratory.PNG?width=300.
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- Q1544764 wikiPageWikiLink Q7115542.
- Q1544764 wikiPageWikiLink Q7773050.
- Q1544764 wikiPageWikiLink Q7865245.
- Q1544764 awards "IEEE Medal of Honor".
- Q1544764 birthDate "1877-02-14".
- Q1544764 deathDate "1956-01-08".
- Q1544764 field Q43035.
- Q1544764 name "Greenleaf Whittier Pickard".
- Q1544764 nationality Q30.
- Q1544764 residence Q30.
- Q1544764 type Person.
- Q1544764 type Agent.
- Q1544764 type Person.
- Q1544764 type Scientist.
- Q1544764 type Agent.
- Q1544764 type NaturalPerson.
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- Q1544764 comment "Greenleaf Whittier Pickard (February 14, 1877, Portland, Maine- January 8, 1956, Newton, Massachusetts) was a United States radio pioneer. Pickard was a researcher in the early days of wireless. He was responsible for the development of the crystal detector, (cat's whisker detector), a radio wave detector which was the central component in early radio receivers called crystal radios, which were the most widely used radio receivers until about 1920 and continued to be used until World War 2.".
- Q1544764 label "Greenleaf Whittier Pickard".
- Q1544764 depiction Greenleaf_Whittier_Pickard_in_his_Boston_laboratory.PNG.
- Q1544764 name "Greenleaf Whittier Pickard".