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Cookie
12-16-2008, 03:06 PM
What was the primary use of a Leyden Jar?
(no looking it up) :D
http://arapaho.nsuok.edu/~bradfiel/leyden.htm

Thatguy
12-16-2008, 03:09 PM
What was the primary use of a Leyden Jar?
(no looking it up) :D
http://arapaho.nsuok.edu/~bradfiel/leyden.htm
To store Leydens.

Cookie
12-16-2008, 03:11 PM
ha ha ha ha, that's a good one, I like it.

sjsmithjr
12-16-2008, 03:19 PM
To store electricity. Static; I think. Can I follow the link now?

Cookie
12-16-2008, 03:26 PM
go ahead if you dare...:)

Speedy Petey
12-16-2008, 04:21 PM
Is a leyden some sort of cookie? I hope so! :p

Speedy Petey
12-16-2008, 04:21 PM
Damn! It's not a cookie. :(

Cookie
12-16-2008, 04:22 PM
ha ha ha ha, a cookie jar?

sjsmithjr
12-16-2008, 04:26 PM
go ahead if you dare...:)

On second thought, you'd better tell me how to safely discharge a capacitor first! :eek:

Cookie
12-16-2008, 04:31 PM
Leyden's Jars (http://www.everything2.com/title/Leyden%2527s%2520Jars) can hold enough electricity (http://www.everything2.com/title/electricity) to rival that of a small lightning bolt (http://www.everything2.com/title/lightning%2520bolt). Leyden's jars are completely harmless (http://www.everything2.com/title/harmless) if treated correctly but can be harmful or even fatal (http://www.everything2.com/title/fatal) when discharged (http://www.everything2.com/title/discharged) after being filled. The best way to avoid being harmed by one of the death (http://www.everything2.com/title/death) jars is to simply leave it without a top (http://www.everything2.com/title/top). This ensures that no electrons (http://www.everything2.com/title/electrons) are submitted into the object (http://www.everything2.com/title/object). It is also perfectly fine to leave one of these jars with the top ajar so that the opening is not covered. This is only effective if the top of the jar is NOT grounded (http://www.everything2.com/title/grounded).
No matter how the jar is positioned, top on or off, grounded or not the jar will never ever cause harm if held the right way. What makes this jar dangerous (http://www.everything2.com/title/dangerous) is the discharge of electrons (http://www.everything2.com/title/electrons). The only way to discharge the jar is too complete the circuit (http://www.everything2.com/title/circuit) allowing the electrons to flow through an intermediate object and become grounded.
If the jar is only held around the middle where the tin foil (http://www.everything2.com/title/tin%2520foil) is then the holder is safe (http://www.everything2.com/title/safe) because the electrons inside can't get out.
If one touches the top of the jar, similarly the loop is not complete and the jar will do nothing. Under No Circumstances, no matter how safe you think you are being, never touch the top of the jar and the middle when the jar is assembled. This releases the charge and can cause death.

Cookie
12-16-2008, 04:35 PM
My friend and I were discussing these, they were once used in physics classes in high schools. I wonder if so today. I hope so.

Thatguy
12-18-2008, 11:52 AM
Theoretically, the short circuit current of a capacitor is infinite. I guess that's where they get the lightning bolt stuff.

The last sentence below is probably a pun.

St. Petersburg, 6 August 1783. Prof. Richman and his assistant being struck by lightning while charging capacitors. The assistant escaped almost unharmed, whereas Richman was dead immediately. The pathologic analysis revealed that "he only had a small hole in his forehead, a burnt left shoe and a blue spot at his foot. [...] the brain being ok, the front part of the lung sane, but the rear being brown and black of blood." The conclusion was that the electric discharge had taken its way through Richmann's body. The scientific community was shocked.

hj
12-18-2008, 01:46 PM
To make your hair stand on end when you touch it. And drag the arc around when you move your finger.

Cookie
12-18-2008, 02:17 PM
Yeah, you got to be careful. But, science is a lot of fun, too. I was just talking to someone which made me remember when I won my first science award with Westinghouse, when I was 13 years old. It was using a glass insulator and capacitor, and I lit up the map of the United States. Each state had a small bulb. I even magnetized the sand used in the desert. lol. It was pretty cool. If I sat and thought long enough, I might be able to remember how I did it. But, I am so old...my memory goes in and out.:D

Thatguy
12-18-2008, 02:26 PM
The mortality tables give me 22 more years. That could be good and bad.:confused:
If I somehow survive all the hazards between now and then, the tables give me a few more years, and so on until I reach 110, in which case I get one more year.:eek:

The built-in life span for people is about 85.
http://www.amazon.com/Vitality-Aging-Implications-Rectangular-Curve/dp/0716713098/ref=sr_1_5?ie=UTF8&s=books&qid=1229640416&sr=1-5

". . . went to pieces all at once, --
All at once, and nothing first, --
Just as bubbles do when they burst."

Cookie
12-18-2008, 02:41 PM
You are still young!

Cookie
12-18-2008, 03:26 PM
This is a great thing for kids.
My own sons were involved.

http://www.westinghousenuclear.com/Community/WSHI/

Redwood
12-18-2008, 04:10 PM
Leyden Jars are neat...
But playing with a Tesla Coil was way cool!

Holding tight on a metal rod with a 1' arc going to it, hair standing on end, and a flouresent tube glowing in the other hand...:eek:

Yea that was neat!

Thatguy
12-18-2008, 05:36 PM
Leyden Jars are neat...
But playing with a Tesla Coil was way cool!

Holding tight on a metal rod with a 1' arc going to it, hair standing on end, and a flouresent tube glowing in the other hand...:eek:

Yea that was neat!
And a neon sign transformer, 7.5 kV to 30 kV, will give you the arc but at a dangerous level of current.

Cookie
12-18-2008, 07:02 PM
I was at the supermarket and when I opened the fridge doors I got ZAPPED so hard, the person standing next to me, felt it, lol. We both yelled. :eek:

Redwood
12-18-2008, 07:44 PM
And a neon sign transformer, 7.5 kV to 30 kV, will give you the arc but at a dangerous level of current.

A neon sign transformer might be a good initial power supply for a Tesla Coil but you have to do some serious stepping up to get the high voltage where you want it for a Tesla Coil. Plus it needs a bit of RF too.

http://i44.photobucket.com/albums/f2/Redwood39/1349460289_6eee19c248.jpg

Cookie
12-18-2008, 08:06 PM
http://www.zatras.com/~share/images/Zatras/trouvailles/videos/2007/01/monty-star-wars.jpg

Macman
12-19-2008, 05:41 AM
We used to make Jacob's Ladders using neon sign transformers. Very cool, but also very dangerous.