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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Correct.
We have a winner. (although the Overclockers forum got it first) There are three one inch NIB magnets behind the lower JL with North pole closest. The left terminal is positive and the force pushes it down at a much faster rate than the simple air convection makes it go up.
OK well that was fun and you scored a pass.
However, after some thought I realise that there is another way to achieve an identical photo WITHOUT magnets. It is tricksy and complicated and should work perfectly. So for a distinction, how could I do this?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Nik wrote ...
Put the bi-ladder on its side and turn your camera. the air currents at right angles would do nothing.
Slightly in the right direction of the answer I am looking for. Air currents at right angles still blow the hot air away and prevent the spark going to the wider end.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
The lorentz force should keep the arcs moving away from each other if the bi-ladder was on its side without magnets. Other then that maybe having the powersuply wires behind the arc in the same way that some railguns have the "magneticly augmented" rails.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Nik wrote ...
The lorentz force should keep the arcs moving away from each other if the bi-ladder was on its side without magnets. Other then that maybe having the powersuply wires behind the arc in the same way that some railguns have the "magneticly augmented" rails.
Yes Lorentz forces will do it but not at this power level. Try it yourself. I do recall a railgun with a crossover arrangement of supply wires to increase the Lorentz force. Might work but there are insulation factors to bear in mind which limit the number of windings. Not what I was thinking of though.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
If you put it on its side, and bent the ladder wires up slightly. So looking down on it from straight up it would appear to be flat, but its actually on an angle... maybe that is enough that the heat could pull it out and up?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
No-one has worked out the way without magnets. I won't have time to try it so here it is.
Fix the camera, light source and Jacobs bi-ladder in a box with flexible HV leads. Use a long exposure. Half way through the exposure, turn the box upside down.
The final exposure will have sparks in both directions with constant lighting.
You could also get a similar look by blowing air up and then changing and blowing down half way through the exposure.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
No motion blur as the camera, lights and JL are all fixed in the box. Lighting is as good as you want to make it. It can look fine. There will be some ladder effect on each side trying to go the wrong way. This setup is best done without the central electrode to get the bidirectional effect.
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Jacob's Bi-ladder
