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
Richard Arkwright and John Kay of Great Britain invented the water frame in the late 1760s, and Arkwright applied for a patent in 1769. The patented spinning machine twisted 96 strands of yarn simultaneously.Full Answer >
Barbed wire was developed by several people, but the first person to patent it was Joseph Glidden. Inspired by a wire fencing prototype displayed at the 1873 DeKalb County Fair in Illinois, Glidden experimented with different wire twist methods and finally filed his patent on November 24, 1874.Full Answer >
Peter Cooper Hewitt became the inventor of the first fluorescent lamp when he was awarded a patent in 1901 for his low-pressure mercury vapor lamp. The first high-pressure mercury vapor lamp, invented by German-born Edmund Germer, Friedrich Meyer and Hans Spanner, was patented in 1927.Full Answer >
According to Civil War Washington and an official petition for freedom from slavery, Osbourn Dorsey was "about eight months" old on May 19, 1862. This means his estimated birth date is around Sept. 19, 1862, but the exact date is not known.Full Answer >