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Registered Member #3700
Joined: Sat Feb 19 2011, 12:59PM
Location:
Posts: 107
Ya,
The corona inside the jars may be seen with a small mirror and dark roon.
The dark room will allow you see any eventual corona with all machine running.
To check the insulation your plywood you may connect a piece of plywwood between the alive terminals of the jars and sse a reduction in the spark lenght.
Wath is the thickness of the pvc insulation in th jars ? Are the armature (external aluminun electrode conected by a solid wire or by the wood base?
Maybe you try use 4 jars connected in series and see the spark length.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
The only thing that I can think of is to lower dissipative losses. The wood is going to act like a very large resistor, especially on a moist day, so getting the wood sealed while very dry may be something to look into. Also, if the wood is being used as an insulator, that may have to be changed for plastic.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The wood disks at the centers surely cause leakage. You could use acrylic, or HDPE (cutting boards) instead of wood with the same mechanical function. The thin bars of the charge collectors around the disks cause corona, and more leakage. Use thick tubes there, that can also be wood parts with wires inside. Look at other conductors connected to the terminals. They shall be always thick, without points or sharp corners. I am not sure of the effect of those triple-ball terminals. I like to use double balls, with the smaller ball with diameter around 1/8 of the desired spark length, and the bigger ball two times or more larger. Arrange the terminals so the positive terminal is inclined in the direction of the negative. This produces the longest spark length. It is easy to find what is the positive, since if you incline the negative terminal in the direction of the positive only small sparks can be obtained. The Leyden jars must have metal foil inside and outside. The connection to the inner terminal may be anything that produces a good contact with the internal foil. Chains may be not the best option. The connection between the outer foils must be good too. If you use tubes, the bottoms of the tubes must be solidly sealed, and this is not easy. A plastic plug fixed with hot glue may work.
Registered Member #46265
Joined: Sun May 11 2014, 06:01PM
Location: AMBALA CANTT, INDIA
Posts: 9
DEAR TONY, HAZMATT, ANTONIO
the machine has already been sent to the the customer for approval. he wants 10 -15 pcs of these. am leaving today to Mumbai (Bombay) to reassable it there, as you can see in the attached photos, many things were taken off for portability, easy, and safe transportation. Mumbai is about 1800 Kms. from Ambala Cantt where i am situated. Thanks to all of you for your suggestions will try there. thanks once again but keep posting more suggestions they are needed all the time. regards RAJEEV TUTEJA
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Giant Wimshurst Machine - could use some guidance
