The freezer was invented in 1876 by Carl von Linden, a German engineer. However, his invention was based on the work of earlier experiments with refrigeration technology.Know More
The first person to use artificially manufactured ice for food preservation was James Harrison in 1857. His applications were meat packing and brewing.
In 1859, Ferdinand Carre adapted the original design to use ammonia, rather than air.
Carl von Linden's contribution was to establish the process of liquefying gas. In 1927, General Electric released the new technology to the public.
Prior to the invention of the freezer, people used snow and ice to preserve their food.Learn More
Items invented in 1998 include Windows 98, the iMac computer and the MP3 player. Viagra was also approved for use by the United States Food and Drug Administration in 1998.Full Answer >
No single person invented algebra. The roots of algebra extend to the ancient Babylonians, who first developed mathematical techniques to solve problems using algorithms. Later work by Greek, Persian and Indian mathematicians further extended these techniques and laid the foundations for modern algebra.Full Answer >
William Morton first demonstrated the use of ether as an anesthetic, but no one knows who actually invented anesthesia. After Morton's demonstration at Massachusetts General Hospital, several people came forward claiming they had discovered anesthesia much earlier.Full Answer >
In 1897, the pencil sharpener was invented by John Lee Love. He was issued a patent for it on Nov. 23, 1897. That style of pencil sharpener is still in use today in schools and offices around the world, according to About.com Inventors. It was one of several noteworthy inventions of 1897.Full Answer >