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APRIL 1

1578 William Harvey (English Physician, Anatomist Who Explained the Circulation of Blood) William Harvey Medicine Human Anatomy Blood
1776 Marie-Sophie Germain (French Mathematician) Marie-Sophie Germain Mathematics
1865 Richard Zsigmondy (Austrian Organic Chemist) Austrian Scientists & Mathematicians Organic Chemistry 1925 Nobel Laureate for Chemistry
1884 Florence Blanchfield (West Virginia-born Nurse; First Woman to be a Fully Ranked Officer of the U.S. Army) West Virginia Military Figures Medical Professions U.S. Army New York Times
1908 Abraham Maslow (New York City-born Psychologist) New York Scientists & Mathematicians Psychology
Deaths
Persons of Historic Significance Who Have Died on This Date
1950 Charles Richard Drew (Washington, D.C.-born African-American Pioneer in Blood Plasma Research) Washington, D.C. Mathematicians & Scientists Blood Medical Research Famous African Americans
2010 Ed Roberts (Florida-born "Father of the Personal Computer") Ed Roberts Computer Technology Inventors & Inventions Bill Gates & Microsoft

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1682 King Charles II Grants Royal Patronage to Scientists and Academics Founding the Royal Society of London London King Charles II Science Royal Society of London Historic UK
1734 Canada's First Lighthouse Is Put into Service: Louisbourg, Nova Scotia Canada Naval History Lighthouses Fortress of Louisburg
1826 Samuel Morey Patents the First Internal Combustion Engine Connecticut Scientists & Inventors Automotives Inventors & Inventions Patents & Trademarks Historic Firsts Center for the Study of Technology and Society
1852 Nicolas Delin Begins Construction of a Water-Powered Sawmill at the head of Commencement Bay in What Will Become Tacoma, Washington Tacoma, Washington Trees Economics History Link
1869 An Earthquake Rocks San Francisco, California for 18 Seconds. San Francisco, California Earthquakes Learn California
1877 The Founder of Tombstone, Arizona Begins Prospecting Tombstone, Arizona Silver History Channel
1918 The British Royal Air Force Begins Operation British Military Figures Aviation Military History WWI British Royal Air Force History Channel Center for the Study of Technology and Society
"Daylight Savings Time" Goes into Effect Across the U.S. to Save Fuel for the American War Effort Time WWI Florida Historical Society
1935 General Electric Co. Announces the First Radio Tube Made of Metal Radio Inventors and Inventions Business General Electric Historic Firsts History Channel
1946 A Tsunami Created by Alaskan Earthquake Strikes Hilo, Hawaii, Killing More than 170 People Hawaii Alaska Tsunamis & Tidal Waves Earthquake Death History Channel USGS
1952 Alpher, Bethe & Gamow's Big Bang Theory Is Published in Physical Review Cosmology Writer's Almanac
1959 NASA Selects Its First Seven Astronauts NASA Astronauts Historic Firsts NASA
1960 The U.S. Places World's First Weather Satellite (Tiros-1) into Orbit Weather Space Exploration Historic Firsts NASA
1970 American Motors Debuts the First American Sub-Compact Gremlin Automobiles AMX Files History Channel
1971 US/Canada ISIS 2 Satellite Launched to Study Ionosphere Canada NASA Earth Science Space Exploration IEEE Canada
1983 In England, Tens of Thousands Form a 14-mile Human Chain to Protest Nuclear Power England Nuclear Energy Propaganda The BBC
1987 Speaking to Doctors in Philadelphia, President Ronald Reagan Declares AIDS to be "Public Health Enemy No. 1" Philadelphia, Pennsylvania President Ronald Reagan Health Care AIDS New York Times
In Fog, the Tanker Seapride II Topples Towers Carrying 500,000 Volt Transmission Lines Across the Delaware River: $26M Damage Delaware Naval History Electricity Business State of Delaware

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