how can we make a periscope
Periscopes allow you to see something that is not in direct sight but is around a corner, out of sight. It's easy to make a quick periscope at home, for fun.
i will help you the answer is:-
Tsalyer: To make a periscope take a washed milk carton and cut off the slanted tops. Cut a viewing hole through the bottom of each milk carton. Tape a mirror at an angle on the bottom of each milk carton. Then flip one carton over and insert it into the other so the mirrors are opposites. Then paper and paint your cartons. Look here for more
Here's the blueprint on the periscope we've got from the Russians (who now conveniently write in English, ;-D ):
What you need:
- 2 mirrors (approx. 2" by 1", but other sizes work well too)
- a piece of carton (approx. 6 1/2" wide, 8" long. Or roughly 3 times the width of your mirrors and 4 times the height)
- Some paint to give it a nice spy look!
How to make the periscope:
- Draw the lines on your carton as you see them on the plans. Note that there are dashed lines, these are fold lines, don't cut through those. The full lines are cut lines, use scissors to cut through those.
- Paste your mirrors on the spots where it says "mirrors".
- Fold the carton into a box. One mirror is looking up, the other one is looking down. Paste it so it stays box shaped.
- Fold the mirrors in so they are roughly in an angle of 45 degrees. Then fold the side flaps in and paste it to the back of the flap. Both sides!
- You have a working periscope now! Look through the lower mirror, and you can see much higher... over a wall, for instance. Or around a corner!
- Now give it that tough spy look by giving your new apparatus a couple of coats of paint. Think how it should look to blend in with the background. Green and brown is nice for the bushes, bad for the snow!
A periscope is an instrument for observation from a concealed position. In its simplest form it consists of a tube with mirrors at each end set parallel to each other at a 45-degree angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and inarmoured vehicles.
More complex periscopes, using prisms instead of mirrors, and providing magnification, operate onsubmarines. The overall design of the classical submarine periscope is very simple: two telescopes pointed into each other. If the two telescopes have different individual magnification, the difference between them causes an overall magnification or reduction.
Johann Gutenberg, better known for his contribution to printing technology, marketed a kind of periscope in the 1430s to enable pilgrims to see over the heads of the crowd at the vigintennial religious festival at Aachen. Johannes Hevelius described an early periscope with lenses in 1647 in his work Selenographia, sive Lunae descriptio [Selenography, or an account of the Moon]. Hevelius saw military applications for his invention. In 1854, E.H. Marie-Davy (Edme Hippolyte) invented the first naval periscope, consisting in a vertical tube with two small mirrors fixed at each end at 45°. Simon Lake used periscopes in his submarines in 1902. Sir Howard Grubb perfected the device in World War I. Morgan Robertson (1861–1915) claimed to have tried to patent the periscope: he described a submarine using a periscope in his fictional works.
Tanks use periscopes extensively: they enable drivers or tank commanders to inspect their situation without leaving the safety of the tank. An important development, the Gundlach rotary periscope, incorporated a rotating top; this allowed a tank commander to obtain a 360-degree field of view without moving his seat. This design, patented by Rudolf Gundlach in 1936, first saw use in the Polish 7-TP light tank (produced from 1935 to 1939). As a part of Polish–British pre-World War II military cooperation, the patent was sold to Vickers-Armstrong for use in British tanks, including the Crusader, Churchill, Valentine, and Cromwell. The technology was also transferred to theAmerican Army for use in its tanks, including the Sherman. The USSR later copied the design and used it extensively in its tanks (including the T-34 and T-70); Germany also made and used copies. Periscope is widely used in many areas but mainly in submarines and it is very helpful in terms of technology
Periscopes allow a submarine, when submerged at a shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull. A submarine commander in tactical conditions must exercise discretion when using his periscope, since it creates a visible wake and may also become detectable by radar, giving away the sub's position.
The Frenchman Marie Davey built a simple, fixed naval periscope using mirrors in 1854. Thomas H. Doughty of the US Navy later invented a prismatic version for use in the American Civil War of 1861-1865.
Submarines adopted periscopes early. Captain Arthur Krebs adapted two on the experimental French submarine Gymnote in 1888 and 1889. The Spanish inventor Isaac Peral equipped his submarine Peral (developed in 1886 but launched on September 8, 1888) with a fixed, non-retractable periscope that used a combination of prisms to relay the image to the submariner. (Peral also developed a primitive gyroscope for submarine navigation and pioneered the ability to fire live torpedoes while submerged.[unreliable source?])
The invention of the collapsible periscope for use in submarine warfare is usually credited[by whom?]to Simon Lake in 1902. Lake called his device the omniscope or skalomniscope. There is also a report that an Italian, Triulzi, demonstrated such a device in 1901, calling it acleptoscope.
As of 2009 modern submarine periscopes incorporate lenses for magnification and function astelescopes. They typically employ prisms and total internal reflection instead of mirrors, because prisms, which do not require coatings on the reflecting surface, are much more rugged than mirrors. They may have additional optical capabilities such as range-finding and targeting. The mechanical systems of submarine periscopes typically use hydraulics and need to be quite sturdy to withstand the drag through water. The periscope chassis may also support a radio or radar antenna.
Submarines traditionally had two periscopes; a navigation or observation periscope and a targeting, or commander's, periscope. Navies originally mounted these periscopes in the conning tower, one forward of the other in the narrow hulls of diesel-electric submarines. In the much wider hulls of recent US Navy submarines the two operate side-by-side. The observation scope, used to scan the sea surface and sky, typically had a wide field of view and no magnification or low-power magnification. The targeting or "attack" periscope, by comparison, had a narrower field of view and higher magnification. In World War II and earlier submarines it was the only means of gathering target data to accurately fire a torpedo, since sonar was not yet sufficiently advanced for this purpose (ranging with sonar required emission of an electronic "ping" that gave away the location of the submarine) and most torpedoes were unguided.
21st-century submarines do not necessarily have periscopes. The United States Navy's Virginia-class submarines and the Royal Navy's Astute Class submarines instead use photonics masts, pioneered by the Royal Navy's HMS Trenchant, which lift an electronic imaging sensor-set above the water. Signals from the sensor-set travel electronically to workstations in the submarine's control center. While the cables carrying the signal must penetrate the submarine's hull, they use a much smaller and more easily sealed—and therefore less expensive and safer—hull opening than those required by periscopes. Eliminating the telescoping tube running through the conning tower also allows greater freedom in designing the pressure hull and in placing internal equipment.
A periscope is an instrument for observation from a concealed position. In its simplest form it consists of a tube with mirrors at each end set parallel to each other at an angle of 45�. Commonly periscope is used in submarines for viewing the surface of water.
It is very easy to make a periscope. All you need is two small plane mirrors and a pipe. Cut the ends of the pipe at 45o, parallel to each other. Make a hole on the Top edge and bottom edge (which are opposite to each other) of the pipe, by cutting away. Now place the mirrors on the ends of the pipe and tape them tightly. Our periscope is ready.