• Light bulb • Electrical telegraph • Reflecting telescope
A light bulb, or electric light or electric lamp is a device that produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and many other purposes.
It was invented in 1880 by Joseph Swan. Cheap and reliable lighting was a holy grail for 19 th century inventors. But didn’t Thomas Edison get there first? No! He was beaten by to it by Britain’s very own Joseph Swan got his patent - and started manufacturing and selling his bulbs - in 1880. The first bulbs lasted little more than 12 hours but, unlike gas lamps, there was no flame or dirty smoke and they caught on.
Electrical telegraph An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via dedicated telecommunication lines or radio. The electromagnetic telegraph is a device for human-tohuman transmission of coded messages.
It was invented in 1837 by Charles Wheatstone and William Cooke, The electric telegraph was a world-shrinking technology like no other. The first fully operational telegraph ran from 1839 between Paddington and West Drayton railway stations, but at first it was slow to catch on. That is, until New Year’s Day 1845 when the telegraph system helped catch murderer John Tawell. It was a sensation and telegraph cables were soon everywhere.
REFLECTING TELESCOPE A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. Reflecting telescopes come in many design variations and may employ extra optical elements to improve image quality or place the image in a mechanically advantageous position
It was invented in 1668 by Isaac Newton. As a fellow at Trinity College, Cambridge, Sir Isaac Newton took the idea of a reflecting telescope and turned it into reality. This huge leap forward in telescope technology made astronomical observation much more accurate.
