Kristene09



Q: What was the most important invention in the 19th century (that runs on electriciy)?

 * A: ** LIGHT BULB

 Q:When was it invented?

 * A: ** 1879

Q: Who invented/perfected it?

 * A:  ** A lot of people worked on the light bulb. Humphry Davy was the 1st to invent the light bulb, but Thomas Alva Edison perfected it.

Q: How was it invented?

 * A:  ** It was actually invented by Humphry Davy, but it only stayed lite for a little while. Thomas Edison perfected it by making it stay lite for a long time. To do this he added carben filament (a small strip of material) in a oxegen-free bulb. When he did this the bulb glowed for 40 hours. Thats a little less then 2 days. But Thomas wanted it to glow longer so he changed the shape of the filament to a horse shoe. When he did this the bulb glowed for a 100 hours. Thats a little more than 7 days. Eventually, he improved it some more and it stayed lite for 1500 hours. Thats means it glowed for 60 days.

Q: What does the light bulb do?

 * A: ** Well before light bulbs there was gas. But gas was dirty, unhealthy, and uncomfortable. Also, in the summer gas made the air even hotter and started fires.The light bulb provides us with light when its dark or when you need it.

Q: What is it important?

 * A: ** The light bulb is imporatant becuase it provides us with an easy and safe lighting system.

Q: How does it work?

 * A: ** The filament inside the light bulb gets really hot, and the filament starts to light up.

Q: How many people use them?

 * A: ** In 1891 there was over 1,300 lighting stations and 3 million lamps.

Q: How did light bulbs make my life easier?
= = media type="file" key="Untitled_0004.wmv"
 * A:  ** (the video)

**other invetions:**
sewing machine - the automatic sewing machine was invented in 1810 telephone - it was invented in the 1870s by Alexander Bell battery - the first battery was made in 1800 type writer - the first type writer was made in 1874-1878
 * light bulb**

http://www.ideafinder.com/history/inventions/lightbulb.htm http://inventors.about.com/library/inventors/bledison.htm http://www.juliantrubin.com/bigten/bulbexperiment.html http://www.flickr.com/photos/9523052@N07/3203850255/
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