Quote:
Originally Posted by priller26
Yeah..a Ford Pinto ran right "out of the box" too, but then it would catch fire and blow up if you hit it too hard, so whats your point?
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wots your point?
Quote:
Originally Posted by priller26
I don't smoke "cigs" nor quaff a lot of beer, but the beer I do drink you probably couldn't find nor afford, I guess you assume those that have issues with the game live in a cardbox box, wear wife beater tee shirts, and are on the dole? Btw, you can keep your 50, don't need it  . Also, the correct term is "piss" it away, not "pee" it away, check your thesaurus. |
Check the forum rules...
Quote:
Originally Posted by Buster_Dee
Watts invented the first practical radar-the 1st to be "mass" produced. Experiments in radar went back 50 years more. When CH designers went to industry to help "button it up," they were embarrassed to show that "third best." But it was absolutely effective and do-able at the large scale needed. Hanbury Brown later added "but don't give them the fourth best because it encourages them to throw the whole thing out."
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Contributors:
Heinrich Hertz
In 1887 the German physicist Heinrich Hertz (1857–1894) began experimenting with electromagnetic waves in his laboratory. He found that these waves could be transmitted through different types of materials, and were reflected by others, such as conductors and dielectrics. The existence of electromagnetic waves was predicted earlier by the Scottish physicist James Clerk Maxwell (1831–79), but it was Hertz who first succeeded in generating and detecting what were soon called radio waves.
Guglielmo Marconi
The development of the wireless or radio is often attributed to Guglielmo Marconi (1874–1937). Although he was not the first to "invent" this technology, it might be said that he was the greatest early promoter of practical radio systems and their applications. In a paper read before the Institution of Electrical Engineers in London on March 3, 1899, Marconi described radio beacon experiments he had conducted in Salisbury Plain. Concerning this lecture, in a 1922 paper he wrote:
I also described tests carried out in transmitting a beam of reflected waves across country . . . and pointed out the possibility of the utility of such a system if applied to lighthouses and lightships, so as to enable vessels in foggy weather to locate dangerous points around the coasts...
It [now] seems to me that it should be possible to design [an] apparatus by means of which a ship could radiate or project a divergent beam of these rays in any desired direction, which rays, if coming across a metallic object, such as another steamer or ship, would be reflected back to a receiver screened from the local transmitter on the sending ship, and thereby immediately reveal the presence and bearing of the other ship in fog or thick weather.[6]
This paper and a speech presenting the paper to a joint meeting of the Institute of Radio Engineers and the American Institute of Electrical Engineers in New York City on June 20, 1922, is often cited as the seminal event which began widespread interest in the development of radar.[7]
Christian Hülsmeyer
In 1904 Christian Hülsmeyer (1881–1957) gave public demonstrations in Germany and the Netherlands of the use of radio echoes to detect ships so that collisions could be avoided. His device consisted of a simple spark gap used to generate a signal that was aimed using a dipole antenna with a cylindrical parabolic reflector. When a signal reflected from a ship was picked up by a similar antenna attached to the separate coherer receiver, a bell sounded. During bad weather or fog, the device would be periodically "spun" to check for nearby ships. The apparatus detected presence of ships up to 3 km, and Hülsmeyer planned to extend its capability to 10 km. It did not provide range (distance) information, only warning of a nearby object. He patented the device, called the telemobiloscope, but due to lack of interest by the naval authorities the invention was not put into production.[8]
Hülsmeyer also received a patent amendment for estimating the range to the ship. Using a vertical scan of the horizon with the telemobiloscope mounted on a tower, the operator would find the angle at which the return was the most intense and deduce, by simple triangulation, the approximate distance. This is in contrast to the later development of pulsed radar, which determines distance directly.
Nikola Tesla
One of the hundreds of concepts generated by Nikola Tesla (1856–1943) included principles regarding frequency and power levels for primitive radio-location units. In an interview published in Century Illustrated Magazine, June 1900, Tesla gave the following:
For instance, by their [standing electromagnetic waves] use we may produce at will, from a sending station, an electrical effect in any particular region of the globe; [with which] we may determine the relative position or course of a moving object, such as a vessel at sea, the distance traversed by the same, or its speed.[9]
In 1917, at the height of World War I, Tesla proposed that radio location techniques might help find submerged submarines with a fluorescent screen indicator. [10] While radar would eventually be capable of detecting submarines on the surface, the required radio frequencies are quickly attenuated in water, making this technique ineffective for detecting submerged submarines.
WIKI