The Band-aid was invented by Earle Dickson in 1920. They were made by hand and not a big hit. They were three inches wide and eighteen inches long. Only $3,000 was sold in the first year. Earle Dickson was inspired to invent the band-aid by his wife, Josephine Dickson, who was always cutting her fingers in the kitchen while preparing food. He noticed that gauze and adhesive tape would fall off active fingers. He decided to make something that would stay in place and protect small wounds better. Dickson took a piece of gauze and attached it to the center of a piece of tape, and then covered the invention and decided to manufacture band-aids to the public. That’s how the band-aid was invented.
The traffic signal was invented in November 20, 1923 by Garret Morgan. The Morgan traffic signal was a T-Shaped pole unit that featured three positions: Stop, Go and an all-directional stop position. This “third position” halted traffic in all directions to semaphore traffic management device was in use throughout North America until all manual traffic signals were replaced by the automatic red, yellow. And green-light traffic signals currently used around the world.
The first modern and practical respirator nicknamed the “iron lung” was invented by Harvard medical researchers Philip Drinker and Louis Agassiz Shaw in 1927. The inventors used an iron box and two vacuum cleaners to build their prototype respirator. Almost the length of a subcompact car, the iron lung exerted a push-pull motion on the chest. The first iron lung was installed at Bellevue hospital in New York City. The first patients of the iron lung were polio sufferers with chest paralysis.
In 1924, tow General Electric researchers, Chester W. Rice and Edward Washburn Kellogg patented the modern, moving coil, direct radiator, loudspeaker, which became the design for all loudspeakers The Rice and Kellogg loudspeakers were sold to consumers under the name of “Radiola” loudspeakers beginning in 1926, and were superior to anything previously invented by lowering sound distortion and raising audio quality for the consumer.
Scotch tape was invented in 1925 by banjo playing 3M engineer Richard Drew. Scotch tape was the world’s first transparent cellophane adhesive tape. Made with a nearly invisible adhesive, the waterproof transparent tape was made from, oils, resins, and rubber, and had a coated cellophane backing.
Duncan is best know for being responsible for promoting the first great yo-yo fad in the United States. Duncan was not the inventor of the yo-yo; they have been around for over twenty-five hundred years. In fact the yo-yo is considered the second oldest toy in history; the oldest being the doll.
In 1929, American Paul Galvin, the head of Galvin Manufacturing Corporation, invented the first car radio. The first car radios were not available from carmakers. Consumers had to purchase the radios separately, Galvin coined the name “Motorola” for the company’s new products combining the idea of motion and radio.
Engineer Benjamin Holt built a crawling tractor, which he called “caterpillar” in 1885. Later, scraping blades were attached and in 1923, LaPlant-Choate Manufacturing Company produced the first bulldozer in 1923.