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Morgan
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Today I found a good example of a platinum anode and lead cathode in dilute sulfuric acid making and breaking a circuit over 1000 times a second,
capable of producing ~50 centimeter sparks.
Large induction coil with Wehnelt interrupter
http://www.youtube.com/watch?v=m87-paje-ZI
[Edited on 6-12-2013 by Morgan]
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Morgan
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This old book entitled "The Theory, Design and Construction of Induction Coils" was published in 1908. Reading down through the pages I came across
some interesting topics on interrupters, the state of the art for the time I guess as things evolved. Page 149 had a curious rectifier made with a
lead and aluminum electrode using an alkaline phosphate. The simple platinum electrode Wehnelt interrupter is described with variations as well as the
mercury Foucault interrupter seen in the third device presented in this video from Florence, Italy. Funny all the little properties and/or
difficulties in design to overcome in the twenty or so pages on interrupters.
Induction coils (spark coils)
http://www.youtube.com/watch?v=btpFGpmAV0s
http://books.google.com/books?id=e0QOAAAAYAAJ&pg=PA128&a...
[Edited on 12-12-2013 by Morgan]
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bismuthate
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Now that christmas is coming who's up for exploding snowmen?!
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Morgan
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Here's an old device that might be amusing to make an ignition system out of. Be the first on your block. ha
"A special link could be included in the chain which incorporated an interrupter circuit. The purpose of the interrupter is to rapidly connect and
disconnect the circuit so that the normally steady current of the battery is turned into a rapidly varying current. The usual practice in the use of
medical electrical batteries was to feed the output of the interrupter to an induction coil in order to increase the voltage applied to the patient by
transformer action. In Pulvermacher's patent however, there is no mention of using induction coils - the Pulvermacher battery could produce large
voltages merely by adding more links to the chain. However, the interrupter still had an effect in that an interrupted current produces a stronger
sensation of electric shock in the patient than a steady current."
"Even Bird, at the height of his dispute with the Pulvermacher company found himself able to say "the battery of Pulvermacher is an ingenious and
useful source of electricity..."
http://en.wikipedia.org/wiki/Pulvermacher_chain
http://www.scienceantiques.com/Photos/pages/Pulvermachers-Ch...
[Edited on 14-12-2013 by Morgan]
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Metacelsus
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I did that once a few years ago with 7.5 grams of flash powder, back in my kewlish days. It's a great way to piss off your neighbors!
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Morgan
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An ice bomb effect might be nice for a snowman.
"This demonstration is dangerous and the required equipment can be difficult to obtain."
http://www.youtube.com/watch?v=uE_fhooANhE
Maybe something like this thick aluminum Cuisinart bottle or a small steel CO2 paintball tank would fracture suddenly. I suppose though a tempered
metal would be needed or work best. I wonder how small you could make an ice bomb? Imagine a cluster of tiny bombs in an acetone/dry ice bath going
off like popcorn.
http://www.amazon.com/Cuisinart-SM4-CO2-Cartridge-4-Ounce-Re...
[Edited on 14-12-2013 by Morgan]
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bismuthate
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That would be absolutely amazing but I don't have experience in EMs so I shouldn't try that  . (hopefully next year).
Although I could make a chlorate/Ba(NO3)2/Al and another like it using St(NO3)2 and put it inside the snowman.
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