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Period: to
1900-1999
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The Air Conditioning
Willis Carrier invents the air conditioner. -
The Helicopter
The very first piloted helicopter was invented by Paul Cornu. -
The Model-T
The Ford model-T was first sold -
Stainless Steel
Stainless steel was invented by Henry Brearly. During his experiments Brearley made several variations of his alloys, ranging from 6% to 15% chromium with differing measures of carbon. On the 13th August 1913 Brearley created a steel with 12.8% chromium and 0.24% carbon, argued to be the first ever stainless steel. -
Crosswords
The first known published crossword puzzle was created by a journalist named Arthur Wynne from Liverpool, and he is usually credited as the inventor of the popular word game. December 21, 1913 was the date and it appeared in a Sunday newspaper, the New York World. -
The Pop-Up Toaster
The pop-up toaster invented by Charles Strite. While General Electric built the first electric toaster for the home in 1909, it was 10 years later when Minnesota mechanic Charles Strite created an easy-to-use toaster designed for restaurants. -
Lie Detector
John Larson invented the lie detector. In 1902 an inadequate lie detector test was invented by a man named James McKenzie. Later on in the 18th century, 1921, a medical student, John Larson, from the University of California invented the modern polygraph instrument, which was much more accurate in its results than the previous machine. -
Spiral Notebook
The first mention of the spiral notebooks has been found in the popular magazine in their issue dated October 1934. The article shows readers how to bind the pages together using a coil spring, which is what a spiral notebook is all about
