According to the Grolier Encyclopedia, the electronic television was successfully displayed for the first time on Sept. 7, 1927 in San Francisco. This predecessor of the modern television was invented by Philo Taylor Farnsworth, a 21-year-old Utah native.Know More
The early television was developed by RCA. The company televised a speech by Franklin Delano Roosevelt in 1939, making Roosevelt the first President of the United States to appear on television.
Television remained quite experimental during the following years, and in 1946, there were only 6,000 television sets in use, according to the Grolier Encyclopedia. Television grew by leaps and bounds after World War II, and commercial television as it is known today began in the late 1940s.Learn more in Inventions
According to the Federal Communications Commission, Vladimir Kosma Zworykin filed two patents for early versions of the television in 1923. However, RCA revealed the first black-and-white television sets sold to the American public at the World’s Fair in 1939.Full Answer >
While the specifics regarding who first invented the cannon are not known, it is believed that the Chinese fielded the first small hand cannons in the year 1260. Cannon designs in Europe continued to evolve throughout the 17th century.Full Answer >
Though nobody knows who exactly invented the crowbar, it was used as a construction tool as early as the year 1400, when it was first documented in the English language as a "crow," according to Snopes.Full Answer >
Dr. Ian Donald invented the first ultrasound machine in 1957 and tested it on patients a year later. The discovery was made in Glasgow, Scotland, and by the end of the 1950s ultrasounds became routine in Glasgow hospitals.Full Answer >