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5 days ago · Propeller. Patented a design for a steam-powered “flying machine” (1889, and refined in 1891); [131] successful track-tethered test of a steam-engine powered biplane (Jul 1894); [132] designed and constructed a biplane that never flew (1910) [133] John Alexander Douglas McCurdy. 2 Aug 1886. 25 Jun 1961.
3 days ago · Alexander Graham Bell, Scottish-born American inventor, scientist, and teacher of the deaf whose foremost accomplishments were the invention of the telephone (1876) and refinement of the phonograph (1886).
- David Hochfelder
- Alexander Graham Bell was a Scottish-born American inventor and scientist. Bell was born on March 3, 1847, in Edinburgh, Scotland. In 1870 Bell and...
- Although Alexander Graham Bell is best remembered as the inventor of the telephone, he invented other devices too. Bell developed several sonic tec...
- The first telephone had two parts: a transmitter and a receiver. The transmitter comprised three parts—a drumlike device (a cylinder with a covered...
3 days ago · The development of vaccines continued at a fairly slow rate until the last several decades when new scientific discoveries and technologies led to rapid advances in virology, molecular biology, and vaccinology. Here we present a timeline of the vaccine- and immunization-related events that have occurred since Jenner’s critical discovery.
6 days ago · Primary sources offer an inside view of a particular event. Some types are: Original Documents: Diaries, speeches, letters, minutes, interviews, news film footage, autobiographies, official records. Creative Works: Poetry, drama, novels, music, art, films.
- Marcia Whitehead
- 2009
2 days ago · The hijacked United Airlines Flight 175 approaching the South Tower (left) as the North Tower (right) burns next to it. The September 11 attacks of 2001, in addition to being a unique act of terrorism, constituted a media event on a scale not seen since the advent of civilian global satellite links.
3 days ago · The sample includes a medication schedule log for a person with diabetes, showcasing how you and your patients can utilize this template to track all their medications. Feel free to view it here or download a PDF copy.
4 days ago · Stanton Macdonald-Wright (born July 8, 1890, Charlottesville, Virginia, U.S.—died August 22, 1973, Pacific Palisades, California) was a painter and teacher who, with Morgan Russell, founded the movement known as Synchromism about 1912.
