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 in Inventions
Jeans were officially invented in 1873, the year that Levi Strauss and Jacob Davis received their patent for hardy blue twill fabric pants with riveted seams. The fabric associated with jeans predates the patent by centuries, but it was not until 1873 that this specific style of pants was invented.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 >
The earliest working telescope design is attributed to Dutch eyeglass maker Hans Lippershey, who applied for a patent to his design in 1608. Two other Dutch eyeglass-making contemporaries of Lippershey, Zacharias Janssen and Jacob Metius, had developed similar telescope designs in the same year.Full Answer >
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 >