Mascara Nocturna

N Shadow mask

The shadow mask is one of the two main technologies used to manufacture televisions and computer screens of cathode ray tubes (CRT) that produce color images (the other is the opening per grid). The tiny holes made in the metal plate separate color phosphorous layer behind the front glass of the screen. Phosphorous for each pixel the red, green, and blue are usually arranged intriangular form (sometimes called a triad).All first color television and most computer monitors, past and present, using shadow mask technology.

SHADOW MASK EXAMPLE.

PHOTOMETER.

In a broad sense, a photometer is any instrument used to measure the intensity of light. Those used for photometry, are instruments to detect: Bunsen photometer.
Scattered light intensity.
Absorbance.Fluorescence.
The two most important in astronomy are the photoelectric photometer and CCD photometer: the first, but is still used, is deprecated because the CCD chip has many advantages over the previous (linearity, lower prices, higher reliability, wide response to the electromagnetic spectrum, more precisely, etc.).

The photoelectric photometer was born in the late nineteenth century in England,improved in the United States in the early twentieth century and reached maturity in the 50s of last century, falling into disuse as digital technology first, and then CCD was increasing accuracy and reducing its price.
In the most recent astronomical articles (year 2005) has presented the magnitude of the stars of open cluster M67 with an accuracy of 0.0001 magnitudes or more, somethingunthinkable a few years ago when the highest accuracy was 0.001 magnitudes (can 0.01 compared with the quantities that can be extracted from the photographic photometry, employing high quality microdensitometers).

PHOTOMETER EXAMPLE.

TELEGRAPH.
On May 6, 1833, the Franciscan, German astronomer and physicist Johann Carl Friedrich Gauss and his friend, Wilhelm Eduard Weber, installed a telegraph linelength of 1000 meters above the roofs of the German population of Göttingen where they both worked, linking the university astronomical observatory. This device was invented by American Samuel Morse in 1832. At first, the system lacked a code for communication, but soon they created an alphabet based on the amplitude of the signals thus giving a real ability to communicate his invention.Telegraph is a Telecommunication device for Transmitting signals over long distances. The most widely used over the years Has Been the electric telegraph, But Also Telegraphs Used Different optical and functional forms.

TELEPHONE.
The phone is a telecommunication device designed to transmit acoustic signals through electrical signals at a distance.
For a long time was considered Alexander Graham Bellinvented the telephone, along with Elisha Gray. But Bell was not the inventor of this device, but only the first to patent it. This happened in 1876. On June 11, 2002 the U.S. Congress passed resolution 269, which recognized that the inventor of the telephone was Antonio Meucci, who called telephone, and Alexander Graham Bell. In 1871 Meucci was only able to, economic hardship; provide a briefdescription of his invention, but not to formalize the patent before the Patent Office United States.
History of invention
Around the year 1857 Antonio Meucci set up a phone to connect your office to your bedroom, located on the second floor, because of his rheumatism esposa.1 however lacked the money to patent his invention, so that was presented to a company (Western Union, who promoted the"invention" of Graham Bell) who ignored him, but that also returned the materials. Apparently, and this is not proven, these materials fell to Alexander Graham Bell, who used them to develop your phone and it as his own.
In 1876, after discovering that to transmit human voice could only be used a direct current, the Scottish-born American inventor Alexander Graham Bell built and patented a few...