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Re: Jacobsladder-Oscillator



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Kurt,

Here's an experiment for you. Can you very slowly bring the power up on the JL but not to the point of starting an arc. I'm curious how a 60 Hz field can cause an oscillation of 1 Hz. I'm thinking the sudden application of power is causing its natural response. If so, maybe a slow ramp up will not cause the rods to rock.

Gerry R.


Original poster: "Kurt Schraner" <k.schraner@xxxxxxxxxxx>

Ed,

I'm fairly shure, the dominant mechanism is electrostatic attraction. Why? - When we first became aware of the wire-movement, I first thought of an effect of current and magnetic forces, as you describe. But then we asked "which current?", because we verified, the JL-wires were moving _without_ any spark (If you watch again the first movie-clip, you may notice, the wires are moving without any spark, in the beginning). So, I changed mind, and thought it would be a matter of the fairly strong E-field between the wires. Calculating the capacitance of the JL revealed about 20pF. Guessing the force between the wires, under 50kV, came out to about 0.41 Newton (0.093 lbf). This value seemed plausible to me, beeing enough for starting the movement.

The case may be different, if there are sparks moving up the JL: apart from electric- and magnetic field forces, the thermal disturbances in the air also take part in the whole process...? - But this is a different case vs. the "JL-oscillator".

Kurt

Tesla list wrote:
Original poster: Ed Phillips <evp@xxxxxxxxxxx>

 Have you considered another mechanism for the ends of the ladder
moving apart as the arc moves up? Should be magnetic forces as well,
similar to the ones on the rails in the rail gun.

Ed