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Transcript of The Periscope
History of the Periscope
Johannes Gutenberg was the first inventor of the Periscope. He invented it in the 1430's. The main purpose for it was for pilgrims to see over the heads of people at a religious festival. Gutenberg lived from 1395-1468 in Mainz, Germany.
In 1854, Marie-Davy invented the very first Naval Periscope. He was born in Clamecy, Nievre, France in 1820 and lived until 1893. He invented the Periscope specifically for the French Navy so they could see above the sea/ocean and so they could attack their enemies without the enemies noticing that they were there.
Sir Howard Grubb
Sir Howard Grubb was an Irish optical designer from Dublin, Ireland. His father was the owner of the Grubb Telescope Company. On that note, he developed an early interest for optics. The Grubb Telescope Company was in such a high demand for better inventions for the army. So Grubb then decided to re-invent the Periscope in 1900 that was specially designed for the Royal Navy submarines.
What is the Periscope and how does it work?
Periscopes are tubular optical instruments that use mirrors, lenses and prisms to allow a viewer to see things up high and far away.
Today there are various types of periscopes. The most simplest the Periscope would consist of two mirrors positioned at a 45° angle, one near the objective lens and the other near the ocular lens. The mirrors would reflect incident light rays down a tube and into an ocular lens to create a real image for the viewer to see. More complex periscopes would incorporate additions like lenses, prisms and rotatable body parts. Such periscopes would also allow the user to magnify the image.
Ray diagram for the Periscope
What a Periscope consists of:
-2 plane mirrors (at 45 degrees each)
-2,3 converging lenses in the middle (depending on the type)
-no light source, just light rays coming in and out of the Periscope
-triangular reflectors to create total internal reflection to point light rays in the direction you want to see.
How has this device benefited society?
It has benefited society by...
The Periscope has benefited society by helping out the armies during the first and second World Wars. It has also benefited society by letting people see over obstacles, or even, humans.
Helping kids or teens, like us, have more fun spying on our friends.