The doorknob was invented in 1878 by Osbourn Dorsey when he filed a patent for an internal mechanism that latched doors shut. If Dorsey's knob was on the left side of a door, it unlatched a metal bar on the right side of the door.Know More
The metal rod latched into a hole in the door frame. Homeowners accessed the connection in the frame by unscrewing a small metal cover.
Before doorknobs, homeowners secured doors by using a latch string that looped around a bar to keep strangers out. In ancient times, people raised and lowered bars to secure doors so that people could not get inside.Learn More
The microwave was invented by Dr. Percy LeBaron Spencer.. The technology behind the microwave was discovered by accident when Spencer noticed that his candy bar melted while working on a radar-related project. He made this discovery, shortly after World War II, in 1946.Full Answer >
The first spinning teacup ride at an amusement park was Disneyland's Mad Tea Party, which was an original ride when Disneyland's Fantasyland opened in 1955. The ride was based on the chapter entitled "A Mad Tea Party" from Lewis Carroll's book "Alice's Adventures in Wonderland."Full Answer >
It is believed that the first mechanical clock was invented in 723 or 725 A.D. by Chinese mathematician and monk Yi Xing, also spelled I Hsing. Rudimentary clocks existed prior to that in Europe, but they did not have the escapement mechanism that is characteristic of mechanical clocks.Full Answer >
There is no known biography of Thomas (T. A.) Carrington. All that is known about him is that he filed a patent for a type of range oven on July 25, 1876 in Baltimore, Maryland.Full Answer >