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    DRY-CELL PATENT
    November 15, 1887 - U.S.A.

    German scientist, Dr. Carl Gassner, was issued a U.S. patent (No. 373,064), the first in the U.S. for a "dry" cell. Gassner had already patented his invention in Germany (No. 37,758) on 8 Apr 1886, and also in Austria, Belgium, England, France and Hungary in the same year. The sealed zinc shell which contained all the chemicals was also the negative electrode. Later, he improved the shelf life of the battery by adding zinc chloride to the electrolyte to reduce corrosion of the zinc shell. Gassner's battery was much like the carbon-zinc, general-purpose batteries sold today. By 1896, the National Carbide Company (later Union Carbide and Eveready) produced the first consumer dry cell battery. Two years later, the company made the first D cell.

    ALKALINE DRY-CELL PATENT
    November 15, 1960 - U.S.A.

    A U.S. patent was issued for an alkaline dry-cell to P.A. Marsal, Karl Kordesch and Lewis F. Urry who assigned it to the Union Carbide Corporation, the manufacturer of Eveready batteries (No. 2,960,558). Compared to the existing carbon-zinc dry-cells, it offered an appreciable increase in life-span and efficiency during heavy continuous drains. Its construction used an alkaline electrolyte, manganese dioxide as depolarizer, a zinc powder-gel anode, and certain additives such including mercury and electrolyte-creep inhibitors. The patent gave practical details for commercial production. The patent claimed that whereas four cells in series of the carbon-zinc type gave 4.5 volts to power a 1.25-amp bulb for 45-min to 1-hr, the new alkaline design gave good brilliance after 6 to 7 hours.

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    about Eyesight Myth and Fact

    Myth: Staring at a computer screen all day is harmful to the eyes. Fact: Spending the day staring at a screen can tire or strain your eyes, but it will not hurt them. Make sure lighting doesn't create a glare on your screen. When spending long periods at your keyboard, take a break now and then to rest your eyes to reduce fatigue. Also, don't forget to blink. Your eyes need to stay lubricated to feel comfortable.

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Learn more about online computer games. The article describes the advantages of playing flash games, such as good relaxation, brain training and memory development.

ARTICLE CONTENT :

Can you imagine your life with no personal computer. Most people will definitely answer no to this question. We work on PC when we are at the office. As soon as we come home the first thing we do is turning on our computer. We only turn it off for nights, but in the recent time with the development of technical progress there appeared a chance to download significant volumes of information, for example videos or music, from the Internet.

Downloading takes some time, so people prefer to keep their PC turned on during night and to download. Useful software, the World Wide Web, computer flash games ? we're so used to their presence in our living that it is scarcely conceivable that they can unexpectedly disappear.
Attitude of people to computer games is different. For some of them playing computer flash games is the most favorite hobby and the best way to relax after a hard working day. Some people find them amusing and sometimes spare some time to this kind of activity.

But there is also a category of people that consider computer games to be a total waste of time. They suppose that playing computer flash games destroys people's brain. Actually, flash computer games are really a great source of relaxation. What's more, it was confirmed by scientists that playing flash games affects positively the activity of our brain. Just imagine the situation when you're concentrated on playing a computer flash game. You're attentive to details and always try to think ahead.

That implies that playing flash games develop your thinking abilities and quick reaction ability. But still, computer games should not become the only thing you take interest in. Firstly, spending too much time in front of the monitor has a negative influence on your eyesight. Moreover, take into account that the game is a virtual reality and you should not change your real life with playing flash games. Use playing computer flash games as a way to relax and to exercise your brain and you'll get only positive effect.

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